[msan] Generalize handlePairwiseShadowOrIntrinsic, and handle x86 pairwise add/sub (#127567) x86 pairwise add and sub are currently handled by applying the pairwise add intrinsic to the shadow (https://github.com/llvm/llvm-project/pull/124835), due to the lack of an x86 pairwise OR intrinsic. handlePairwiseShadowOrIntrinsic was added (https://github.com/llvm/llvm-project/pull/126008) to handle Arm pairwise add, but assumes that the intrinsic operates on each pair of elements as defined by the LLVM type. In contrast, x86 pairwise add/sub may sometimes have e.g., <1 x i64> as a parameter but actually be operating on <2 x i32>. This patch generalizes handlePairwiseShadowOrIntrinsic, to allow reinterpreting the parameters to be a vector of specified element size, and then uses this function to handle x86 pairwise add/sub.
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