[clang] [clang][RISCV] Enable RVV with function attribute __attribute__((target("arch=+v"))) (PR #83674)

[Craig Topper via cfe-commits]

================
@@ -8927,8 +8927,13 @@ void Sema::CheckVariableDeclarationType(VarDecl *NewVD) {
     }
   }
 
-  if (T->isRVVSizelessBuiltinType())
-    checkRVVTypeSupport(T, NewVD->getLocation(), cast<Decl>(CurContext));
+  if (T->isRVVSizelessBuiltinType() && isa<FunctionDecl>(CurContext)) {
+    const FunctionDecl *FD = cast<FunctionDecl>(CurContext);
+    llvm::StringMap<bool> CallerFeatureMap;
+    Context.getFunctionFeatureMap(CallerFeatureMap, FD);
----------------
topperc wrote:

Does this impact compile time if the RVV types are used many times in a 
function as they would be for intrinsic code?

https://github.com/llvm/llvm-project/pull/83674
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