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[RISCV] Remove special case for constant shift amount in FSHL/FSHR lo…
…wering to FSL/FSR. Remove fshl/fshr with constant shift amount isel patterns. Replace with fsr/fsl with constant isel patterns. This hack was trying to preserve as much optimization opportunity for fshl/fshr by constant as possible, but the conversion to RISCVISD::FSR/FSL happens so late it probably isn't worth much. The new isel patterns are needed by D117468 anyway.
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