[clang] [clang]use correct this scope to evaluate noexcept expr (PR #77416)

[Timm Baeder via cfe-commits]

================
@@ -6192,6 +6192,12 @@ bool TreeTransform<Derived>::TransformExceptionSpec(
 
   // Instantiate a dynamic noexcept expression, if any.
   if (isComputedNoexcept(ESI.Type)) {
+    // Update this scrope because ContextDecl in Sema will be used in 
TransformExpr.
+    auto *Method = dyn_cast_or_null<CXXMethodDecl>(ESI.SourceTemplate);
----------------
tbaederr wrote:

```suggestion
    auto *Method = dyn_cast_if_present<CXXMethodDecl>(ESI.SourceTemplate);
```

https://github.com/llvm/llvm-project/pull/77416
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