[llvm] [RISCV] Remove codegen for vp_fsub (PR #191832)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index ca84eb350..03969cbe3 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -881,14 +881,14 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
         ISD::VP_CTTZ_ELTS,   ISD::VP_CTTZ_ELTS_ZERO_UNDEF};
 
     static const unsigned FloatingPointVPOps[] = {
-        ISD::VP_FADD,        ISD::VP_FMUL,
-        ISD::VP_FNEG,
-        ISD::VP_FMA,         ISD::VP_REDUCE_FADD, ISD::VP_REDUCE_SEQ_FADD,
-        ISD::VP_REDUCE_FMIN, ISD::VP_REDUCE_FMAX, ISD::VP_MERGE,
-        ISD::VP_SELECT,
-        ISD::VP_SETCC,       ISD::VP_FP_ROUND,    ISD::VP_FP_EXTEND,
-        ISD::VP_SQRT,
-        ISD::VP_IS_FPCLASS,  ISD::VP_REDUCE_FMINIMUM,
+        ISD::VP_FADD,           ISD::VP_FMUL,
+        ISD::VP_FNEG,           ISD::VP_FMA,
+        ISD::VP_REDUCE_FADD,    ISD::VP_REDUCE_SEQ_FADD,
+        ISD::VP_REDUCE_FMIN,    ISD::VP_REDUCE_FMAX,
+        ISD::VP_MERGE,          ISD::VP_SELECT,
+        ISD::VP_SETCC,          ISD::VP_FP_ROUND,
+        ISD::VP_FP_EXTEND,      ISD::VP_SQRT,
+        ISD::VP_IS_FPCLASS,     ISD::VP_REDUCE_FMINIMUM,
         ISD::VP_REDUCE_FMAXIMUM};
 
     static const unsigned IntegerVecReduceOps[] = {

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https://github.com/llvm/llvm-project/pull/191832