[clang] [RISCV][sema] Correct the requirement of `vf[|n|w]cvt.f.*` intrinsics (PR #101608)

[Craig Topper via cfe-commits]

================
@@ -1912,8 +1912,12 @@ def vfcvt_rtz_x_f_v : 
RVVConvToSignedBuiltin<"vfcvt_rtz_x">;
 let Log2LMUL = [-3, -2, -1, 0, 1, 2] in {
   def vfwcvt_rtz_xu_f_v : RVVConvToWidenUnsignedBuiltin<"vfwcvt_rtz_xu">;
   def vfwcvt_rtz_x_f_v : RVVConvToWidenSignedBuiltin<"vfwcvt_rtz_x">;
-  def vfwcvt_f_xu_v : RVVConvBuiltin<"Fw", "FwUv", "csi", "vfwcvt_f">;
-  def vfwcvt_f_x_v : RVVConvBuiltin<"Fw", "Fwv", "csi", "vfwcvt_f">;
+  def vfwcvt_f_xu_v : RVVConvBuiltin<"Fw", "FwUv", "si", "vfwcvt_f">;
+  def vfwcvt_f_x_v : RVVConvBuiltin<"Fw", "Fwv", "si", "vfwcvt_f">;
+  let RequiredFeatures = ["Zvfh"], OverloadedName = "vfwcvt_f" in {
+    defm : RVVConvBuiltinSet<"vfwcvt_f_xu_v", "c", [["Fw", "FwUv"]]>;
----------------
topperc wrote:

Why can't we keep using `RVVConvBuiltin`?

https://github.com/llvm/llvm-project/pull/101608
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