[SPIR-V] Fix pre-legalizer pass in SPIR-V Backend to support more gMIR opcode...

[SPIR-V] Fix pre-legalizer pass in SPIR-V Backend to support more gMIR opcode inserted by IRTranslator (#89890)

Translating global values, IRTranslator pass can sometimes generates
code patterns that require additional efforts during pre-legalization.
This PR addresses this problem to support G_PTRTOINT instruction used in
initialization of GV.