[CodeGen] Add getTgtMemIntrinsic overload for multiple memory operands (NFC) (#175843) There are target intrinsics that logically require two MMOs, such as llvm.amdgcn.global.load.lds, which is a copy from global memory to LDS, so there's both a load and a store to different addresses. Add an overload of getTgtMemIntrinsic that produces intrinsic info in a vector, and implement it in terms of the existing (now protected) overload. GlobalISel and SelectionDAG paths are updated to support multiple MMOs. The main part of this change is supporting multiple MMOs in MemIntrinsicNodes. Converting the backends to using the new overload is a fairly mechanical step that is done in a separate change in the hope that that allows reducing merging pains during review and for downstreams. A later change will then enable using multiple MMOs in AMDGPU.
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