[clang] [clang] Look through parens around reinterpret_cast to emit a warning (PR #157033)

[Mariya Podchishchaeva via cfe-commits]

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@@ -167,6 +167,9 @@ void dereference_reinterpret_cast() {
   (void)reinterpret_cast<float&>(d);  // expected-warning {{reinterpret_cast from 'double' to 'float &' has undefined behavior}}
   (void)*reinterpret_cast<float*>(&d);  // expected-warning {{dereference of type 'float *' that was reinterpret_cast from type 'double *' has undefined behavior}}
 
+  // Look through parens
+  (void)*(reinterpret_cast<double*>(&l));  // expected-warning {{dereference of type 'double *' that was reinterpret_cast from type 'long *' has undefined behavior}}
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Fznamznon wrote:

Do we diagnose that?
```
  (void)(reinterpret_cast<double*>(&l));
```

https://github.com/llvm/llvm-project/pull/157033