[AArch64][ARM] Move ARM-specific InstCombine transforms into `Transforms/Utils` (#169589) Back when `TargetTransformInfo::instCombineIntrinsic` was added in https://reviews.llvm.org/D81728, several transforms common to both ARM and AArch64 were kept in the non-target-specific `InstCombineCalls.cpp` so they could be shared between the two targets. I want to extend the transform of the `tbl` intrinsics into static `shufflevector`s in a similar manner to https://github.com/llvm/llvm-project/pull/169110 (right now it only works with a 64-bit `tbl1`, but `shufflevector` should allow it to work with up to 2 operands, and it can definitely work with 128-bit vectors). I think separating out the transform into a TTI hook is a prerequisite. ~~I'm not happy about creating an entirely new module for this and having to wire it up through CMake and everything, but I'm not sure about the alternatives. If any maintainers can think of a cleaner way of doing this, I'm very open to it.~~ I've moved the transforms into `Transforms/Utils/ARMCommonInstCombineIntrinsic.cpp`, which is a lot simpler.
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