Amara Emerson 64eb3a4915 [AArch64][GlobalISel] Add post-legalize combine for sext_inreg(trunc(sextload)) -> copy ...

On AArch64 we generate redundant G_SEXTs or G_SEXT_INREGs because of this.

Differential Revision: https://reviews.llvm.org/D81993

2020-07-13 20:27:45 -07:00

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