onnxruntime

If Branch Constant Folding (#18105)

### Description

When and if `If` condition proves to be a constant value, inline the
corresponding subgraph yielding to more constant folding and
optimization.

### Motivation and Context
Newly converted models feature lots of nested `If` nodes that can be
inlined and collapsed.

In particular, for the sample models we are gaining on TorchScript
exported models.
For `HF Mobile Bert Dynamo` runtime went down from 0.069 -> 0.046. In
total, AOT inlining + `If` constant folding
yields improvement of about 50% 0.102 -> 0.046. Brining us very close to
TorchScript exported models.

`HF Bart Dynamo` further improves 0.668 -> 0.45. AOT + `If` constant
folding improves 0.98 -> 0.45

Earlier the size of 
HF Mobile Bert **161Mb+**, now **98Mb**
HF Bart Dynamo pre-optimized model was about **1.2Gb**. It is now
**710MB**


![image](https://github.com/microsoft/onnxruntime/assets/11303988/1491a247-d371-4e66-85a3-2aeb702e8ca0)