[RISCV] GISel custom lowering for G_ADD/G_SUB (#121587) Custom lowering for s32 G_ADD/SUB to help match selection dag better. Specifically for RV64 a s32 is produced as a add+sext the output this allows for fewer instructions to sign extend a couple patterns. Allows for the generation of addiw,subw,negw to reduce required instructions to load values quicker Log2_ceil_i32 in rvzbb.ll shows a more obvious improvement case.
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