[clang] [CIR][X86]Implement handling for shiftleft/shiftright builtins in CIR (PR #175049)

[Priyanshu Kumar via cfe-commits]

Priyanshu3820 wrote:

@andykaylor, `-Wno-implicit-function-declaration` did suppress the warning but it still ultimately crashed due to missing abi support. I used `-fms-extensions` with linux triple. This is what you suggested I believe.

https://github.com/llvm/llvm-project/pull/175049