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[GlobalISel] Translate calls to memcpy et al to G_INTRINSIC_W_SIDE_EF…
…FECTs and legalize later. I plan on adding memcpy optimizations in the GlobalISel pipeline, but we can't do that unless we delay lowering to actual function calls. This patch changes the translator to generate G_INTRINSIC_W_SIDE_EFFECTS for these functions, and then have each target specify that using the new custom legalizer for intrinsics hook that they want it expanded it a libcall. Differential Revision: https://reviews.llvm.org/D64895 llvm-svn: 366516
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