[PATCH] D149821: [DAGCombiner] Use generalized pattern match for visitFSUBForFMACombine.

[Yeting Kuo via Phabricator via llvm-commits]

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The patch makes visitFSUBForFMACombine serve vp.fsub too. It helps DAGCombiner
to fuse vp.fsub and vp.fmul patterns to vp.fma.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149821

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/RISCV/rvv/fold-vp-fsub-and-vp-fmul.ll

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