[CIR] Upstream convert to mask builtins in CIR codegen (#171694) This PR is part of https://github.com/llvm/llvm-project/issues/167752. It upstreams the codegen and tests for the convert to mask builtins implemented in the incubator, including: Upstream X86 mask conversion builtins from clangir: - cvtmask2b/w/d/q* - cvtb/w/d/q2mask* Upstreamed helpers: - emitX86MaskedCompare() - emitX86ConvertToMask() - emitX86SExtMask() GitOrigin-RevId: 7ee923d0ecc6bd46bf1b7d90a40c36114a20d66b
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