Implement alive across call for CSE candidates (dotnet/coreclr#27449)

Implement alive across call for CSE candidates (dotnet/coreclr#27449)

* Added the implementation of CSE live across call algorithm

Fix CSE dataflow for Zero Diffs
Perform backward walk of statements in optValnumCSE_InitDataFlow()

Code Review feedback
- Rename cseTraits to cseLivenessTraits
- Move initialization of cseMaskTraits to optCSE_canSwap
- Rework GT_CALL backwards walk for bbCseGen
- Correct comments

Rename cseBit to cseAvailBit and cseBit2 to cseAvailCrossCallBit
Update CSE_DataFlow to handle calls that kill CSE for live across calls

* Code review feedback, added lots of comments
Fixes printing of EXP_SET BitVecs with more than 64 bits

Commit migrated from https://github.com/dotnet/coreclr/commit/470910864eca8172e6f8a3c58beb85176b9a4008