[SPIR-V] Ensure that internal intrinsic functions for PHI's operand are...

[SPIR-V] Ensure that internal intrinsic functions for PHI's operand are inserted at the correct positions (#92316)

This PR is to ensure that internal intrinsic functions for PHI's operand
are inserted at the correct positions and don't break rules of
instruction domination and PHI nodes grouping at top of basic block.