[clang] [clang] Fix-it hint for `++this` -> `++*this` when deref is modifiable (PR #94159)

[Rajveer Singh Bharadwaj via cfe-commits]

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@@ -10,6 +10,7 @@ void h() {
   SEL* ps = &s;
 
   @selector(dealloc) = s;  // expected-error {{expression is not assignable}}
+  // expected-note@-1 {{add '*' to dereference it}}
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Rajveer100 wrote:

One way I can think of is to do a AST visit and check for `ObjCSelectorExpr` in 
the child nodes of the `ValueDecl`.

https://github.com/llvm/llvm-project/pull/94159
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