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This change introduces a GC parseable lowering for element atomic memcpy/memmove intrinsics. This way runtime can provide an implementation which can take a safepoint during copy operation. See "GC-parseable element atomic memcpy/memmove" thread on llvm-dev for the background and details: https://groups.google.com/g/llvm-dev/c/NnENHzmX-b8/m/3PyN8Y2pCAAJ Differential Revision: https://reviews.llvm.org/D88861