Ben Shi cb82de2960 [RISCV] Optimize multiplication by constant ...

... to shift/add or shift/sub.

Do not enable it on riscv32 with the M extension where decomposeMulByConstant
may not be an optimization.

Reviewed By: luismarques, MaskRay

Differential Revision: https://reviews.llvm.org/D82660

2020-07-07 18:50:24 -07:00

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