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.
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