Craig Topper 1a6c1ac686 [SelectionDAG][RISCV] Teach ComputeNumSignBits to handle SREM.
This also removes a pattern from RISCV that is no longer needed
since the sexti32 on the LHS of the srem in the pattern implies
the result is sign extended so the sign_extend_inreg should be
removed in DAG combine now.

Reviewed By: luismarques, RKSimon

Differential Revision: https://reviews.llvm.org/D97133
2021-02-21 11:13:36 -08:00
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