[PATCH] D144535: [RISCV] Enable machine copy propagation for copy-like instructions

[Wang Pengcheng via Phabricator via llvm-commits]

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Like what has been done in AArch64 (D125335 <https://reviews.llvm.org/D125335>).

We enable this under `-O2` to show the codegen diffs here but we
may only do this under `-O3` like AArch64.

There are two cases that we may produce these eliminable copies:

1. ISel of `FrameIndex`. Like `rvv/fixed-vectors-calling-conv.ll`.
2. Tail duplication. Like `select-optimize-multiple.ll`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144535

Files:
  llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
  llvm/test/CodeGen/RISCV/O3-pipeline.ll
  llvm/test/CodeGen/RISCV/copyprop.ll
  llvm/test/CodeGen/RISCV/fpclamptosat.ll
  llvm/test/CodeGen/RISCV/fpclamptosat_vec.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-calling-conv.ll
  llvm/test/CodeGen/RISCV/sadd_sat.ll
  llvm/test/CodeGen/RISCV/sadd_sat_plus.ll
  llvm/test/CodeGen/RISCV/select-optimize-multiple.ll
  llvm/test/CodeGen/RISCV/split-offsets.ll
  llvm/test/CodeGen/RISCV/ssub_sat.ll
  llvm/test/CodeGen/RISCV/ssub_sat_plus.ll
  llvm/test/Transforms/LoopStrengthReduce/RISCV/lsr-drop-solution.ll

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