[msan] Add handlers for AVX masked load/store intrinsics (#123857) This patch adds explicit support for AVX masked load/store intrinsics, largely by applying the intrinsics to the shadows (but subtly different to handleIntrinsicByApplyingToShadow()). We do not reuse the handleMaskedLoad/Store functions. The key challenge is that the LLVM masked intrinsics require a vector of booleans, while AVX masked intrinsics use the MSBs of a vector of integers. X86InstCombineIntrinsic.cpp::simplifyX86MaskedLoad mentions that the x86 backend does not know how to efficiently convert from a vector of booleans back into the AVX mask format; therefore, they (and we) do not reduce AVX masked intrinsics into LLVM masked intrinsics.
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