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Summary: If we didn't set the value for hasSideEffects bit in our td file, `llvm-tblgen` will set it as true for those instructions which has no match pattern. The instructions `MTLR` and `MFLR` don't set the hasSideEffects flag and don't have match pattern, so their hasSideEffects flag will be set true by `llvm-tblgen`. But in fact, we can use `[LR]` to model the two instructions, so they should not have SideEffects. This patch is to modify the hasSideEffects of MTLR and MFLR from 1 to 0. Reviewed By: jsji Differential Revision: https://reviews.llvm.org/D71390
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