[clang] [llvm] [RISCV][VLS] Support RISCV VLS calling convention (PR #100346)

[Craig Topper via cfe-commits]

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@@ -4887,10 +4906,19 @@ bool Sema::CheckCallingConvAttr(const ParsedAttr &Attrs, CallingConv &CC,
     return false;
   }
 
-  unsigned ReqArgs = Attrs.getKind() == ParsedAttr::AT_Pcs ? 1 : 0;
-  if (!Attrs.checkExactlyNumArgs(*this, ReqArgs)) {
-    Attrs.setInvalid();
-    return true;
+  if (Attrs.getKind() == ParsedAttr::AT_RISCVVLSCC) {
+    // riscv_vls_cc only accept 0 or 1 argument.
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topperc wrote:

accept -> accepts

https://github.com/llvm/llvm-project/pull/100346