[msan][NFCI] Generalize handleIntrinsicByApplyingToShadow to allow alternative intrinsic for shadows (#124831) https://github.com/llvm/llvm-project/pull/124159 uses handleIntrinsicByApplyingToShadow for horizontal add/sub, but Vitaly recommends always using the add version to avoid false negatives for fully uninitialized data (https://github.com/llvm/llvm-project/issues/124662). This patch lays the groundwork by generalizing handleIntrinsicByApplyingToShadow to allow using a different intrinsic (of the same type as the original intrinsic) for the shadow. Planned work will apply it to horizontal sub.
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