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ARROW-18019: [C++][Gandiva] Improve Projector evaluation performance (#14394)

1. Some dynamic_casts are not necessary because the safety is checked already.
2. RecordBatch's column(int i) function involves atomic operation and column_data(int i) doesn't. So we prefer to use column_data() instead if column()->data().

Authored-by: Jin Shang <shangjin1997@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>