ARM64: Eliminate redundant opposite mov (#38179)

ARM64: Eliminate redundant opposite mov (#38179)

* Added IsOppositeOfPrevMov()

Added IsOppositeOfPrevMov() that will skip generating redundant mov.

* review comments

* Refactor code into IsRedundantMov()

* dont optimize beyong IG boundary

* add check to not cross IG boundary

* Add more checks:
- Change IG boundary check to exclude extended IGs.
- Check the operand size before removing redundant movs.

* fix the check

* review comments

* Add check to ensure if src/dst are both scalar or both vector

* minor comment

* Add check for insFormat

* fix the typo

* minor comments