Revert "[RISCV] Use zexti32/sexti32 in srliw/sraiw isel patterns to improve...
Revert "[RISCV] Use zexti32/sexti32 in srliw/sraiw isel patterns to improve usage of those instructions." I thought this might help with another optimization I was thinking about, but I don't think it will. So it just wastes compile time calling computeKnownBits for no benefit. This reverts commit 81b2f959.
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