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[RISCV] Remove performANY_EXTENDCombine.
This doesn't appear to be needed any more. I did some inspecting of the gcc torture suite and SPEC2006 with this removed and didn't find any meaningful changes. I think we're more aggressive about forming ADDIW now using sign_extend_inreg during type legalization and hasAllWUsers in isel. This probably helps catch the cases this helped with before.
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