onnxruntime

Enablement of onnxruntime for AIX and fixing issues related to big-endian platform. (#21133)

### Description
Enablement of onnxruntime for AIX and fixing issues related to
big-endian platform.

### Motivation and Context
changes in this PR contains:
1. Enablement code for building onnxruntime on AIX operating system.
2. while testing the build on AIX, we found issues related to big endian
platform . More details about few of those issues can be found in [Big
endian issue: Graph Transformation Attention Fusion tests are failing
#12921](https://github.com/microsoft/onnxruntime/issues/12921)

Below are list of files and the description about the change.
1.	cmake/CMakeLists.txt
[BUILDING on AIX issue] check for "IBMClang" is added for handling
-Wno-unused-parameter
2.	cmake/external/onnxruntime_external_deps.cmake
[BUILDING on AIX issue]Enabling gtest_disable_pthreads for AIX
3.	cmake/onnxruntime.cmake
[BUILDING on AIX issue]
o Blocking codes for AIX which generates generated_source.c and further
requires some symbol files.
o	Putting NO AIX check for non-supported linker flags like --Xlinker
o	iconv linking
4.	cmake/onnxruntime_framework.cmake
[BUILDING on AIX issue]Putting NO AIX check for -Wl,-rpath='$ORIGIN'
5.	cmake/onnxruntime_mlas.cmake
[BUILDING on AIX issue]POWER10 releated macro/function definition .
6.	cmake/onnxruntime_providers_cpu.cmake
[BUILDING on AIX issue]Putting NO AIX check for non-supported linker
flags like --Xlinker
7.	cmake/onnxruntime_unittests.cmake
[BUILDING on AIX issue]
o	Putting NO AIX check for non-supported linker flags like --Xlinker
o Adding required libraries for AIX linker under applicatiion like
onnxruntime_shared_lib_test ,onnxruntime_logging_apis etc
8.	cmake/patches/flatbuffers/flatbuffers.patch
[BUILDING on AIX issue] Handling of TypeCode in
include/flatbuffers/flatbuffers.h under AIX + clang
9.	onnxruntime/contrib_ops/cpu/murmur_hash3.cc
[Big endian issue] Byte-Conversion handlling in compute() and getblock()
routines
10.	onnxruntime/contrib_ops/cpu/quantization/matmul_nbits_impl.cc
[Big endian issue] Handling of test failures . Byte swapping for
quant_value.
11.	onnxruntime/core/framework/tensorprotoutils.cc
[Big endian issue]
Implementation of SetRawDataInTensorProto , ConvertRawDataInTensorProto
.
o SetRawDataInTensorProto : Wrapper for set_raw_data(). Calling
ConvertRawDataInTensorProto() in big-endian system
o ConvertRawDataInTensorProto : function used mainly on big-endian
system for byte-swapping of tensor raw_data
12.	onnxruntime/core/framework/tensorprotoutils.h
[Big endian issue]
Declaration of SetRawDataInTensorProto,  ConvertRawDataInTensorProto
13.	onnxruntime/core/graph/graph.cc
[Big endian issue]
 o	Call ConvertRawDataInTensorProto for SPARSE_TENSOR type
 o	Call ConvertRawDataInTensorProto for SaveToOrtFormat
14.	onnxruntime/core/mlas/lib/platform.cpp
[BUILDING on AIX issue] POWER10 released enablement for AIX
15.	onnxruntime/core/mlas/lib/power/qgemm_kernel_power10.cpp
[BUILDING on AIX issue]Handling of __vector under AIX+clang
16.	onnxruntime/core/mlas/lib/qgemm.h
[BUILDING on AIX issue] Adding _AIX flag
17.	onnxruntime/core/mlas/lib/qlmul.cpp
[BUILDING on AIX issue] Handling of __vector under AIX+clang
18.  onnxruntime/core/optimizer/attention_fusion.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
19.  onnxruntime/core/optimizer/compute_optimizer/shared_utils.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
20.  onnxruntime/core/optimizer/constant_folding.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
21.  onnxruntime/core/optimizer/embed_layer_norm_fusion.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
22.  onnxruntime/core/optimizer/nchwc_transformer.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
23.  onnxruntime/core/optimizer/qdq_transformer/avx2_weight_s8_to_u8.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
24.  onnxruntime/core/optimizer/qdq_transformer/qdq_s8_to_u8.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
25.  onnxruntime/core/optimizer/qdq_transformer/s8_to_u8.h
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
26.
onnxruntime/core/optimizer/qdq_transformer/selectors_actions/qdq_actions.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
27.  onnxruntime/core/optimizer/reshape_fusion.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
28.  onnxruntime/core/optimizer/stft_decomposition.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
29.
onnxruntime/core/optimizer/transpose_optimization/ort_optimizer_api_impl.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
30.	onnxruntime/core/platform/path_lib.h
[BUILDING on AIX issue] Moving to normal function call, instead of
template
31.	onnxruntime/core/platform/posix/env.cc
[BUILDING on AIX issue]Blocking syscall.h in AIX
32.	onnxruntime/core/session/inference_session.cc
[Big endian issue] Removing ORT_RETURN_IF_NOT, FLATBUFFERS_LITTLEENDIAN
33.	onnxruntime/test/flatbuffers/flatbuffer_utils_test.cc
[Big endian issue] Call ConvertRawDataInTensorProto in CreateInitializer
and ExternalWriteReadWithLoadInitializers
34.	onnxruntime/test/framework/sparse_kernels_test.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
35.	onnxruntime/test/framework/tensorutils_test.cc
[Big endian issue] Helper method ConvertEndianessForVector and call this
from required place.
36.	onnxruntime/test/framework/test_tensor_loader.cc
o.  [BUILDING on AIX issue] Handling of getcwd for AIX
o.  [Big endian issue]  Bytes Swapping in run_external_data_test
37.	onnxruntime/test/onnx/main.cc
[Big endian issue] including <thread> for AIX
38.	onnxruntime/test/onnx/tensorprotoutils.cc
[Big endian issue]  Bytes swapping in UnpackTensorWithRawData
39.	onnxruntime/test/optimizer/graph_transform_test.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
40.	onnxruntime/test/optimizer/graph_transform_test_builder.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
41.	onnxruntime/test/optimizer/graph_transform_test_builder.h
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
42.	onnxruntime/test/optimizer/initializer_test.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
43.	onnxruntime/test/optimizer/nchwc_optimizer_test.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
44.	onnxruntime/test/providers/base_tester.cc
[Big endian issue] Use util function SetRawDataInTensorProto, instead of
set_raw_data
45.	onnxruntime/test/providers/cpu/generator/random_test.cc
[BUILDING on AIX issue]  Adding AIX check in MultinomialGoodCase

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Co-authored-by: Vamshikrishna Thatikonda <vamshikrishna@in.ibm.com>