[clang] [llvm] [mlir] [NVPTX] Convert scalar function nvvm.annotations to attributes (PR #125908)

[Artem Belevich via cfe-commits]

================
@@ -179,6 +179,13 @@ static bool argHasNVVMAnnotation(const Value &Val,
   return false;
 }
 
+static std::optional<unsigned> getFnAttrParsedIntOrNull(const Function &F,
+                                                        StringRef Attr) {
+  if (F.hasFnAttribute(Attr))
+    return F.getFnAttributeAsParsedInteger(Attr);
+  return std::nullopt;
----------------
Artem-B wrote:

Nit: Could be just `return F.hasFnAttribute(Attr) ? 
F.getFnAttributeAsParsedInteger(Attr) : {};`

https://github.com/llvm/llvm-project/pull/125908
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