[clang] [clang] Improve diagnostics for constraints of inline asm (NFC) (PR #96363)

[via cfe-commits]

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@@ -2626,14 +2629,20 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
   SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
   SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
 
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurCodeDecl);
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Sirraide wrote:

```suggestion
  const auto *FD = dyn_cast_if_present<FunctionDecl>(CurCodeDecl);
```
`dyn_cast_or_null` is deprecated (also, no need to spell out the type here since it’s already evident from the cast).

https://github.com/llvm/llvm-project/pull/96363