[clang] [RISCV][Sema] Add feature check for target attribute to VSETVL intrinsics (PR #126064)

[Pengcheng Wang via cfe-commits]

================
@@ -623,13 +623,37 @@ bool SemaRISCV::CheckBuiltinFunctionCall(const TargetInfo 
&TI,
   }
   }
 
+  auto checkVsetvl = [&](unsigned SEWOffset,
+                                        unsigned LMULOffset) -> bool {
+    const FunctionDecl *FD = SemaRef.getCurFunctionDecl();
+    llvm::StringMap<bool> FunctionFeatureMap;
----------------
wangpc-pp wrote:

Is there a way to cache this? I don't think we need to re-compute every time.

https://github.com/llvm/llvm-project/pull/126064
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