[clang] [clang][Sema] decay functions to pointers for qualifier discarding and overflow behavior (PR #183616)

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+// RUN: %clang_cc1 -fsyntax-only -verify %s 
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NeKon69 wrote:

There was a lot of cases where clang does not behave like gcc does (in terms of decaying). Now i am even more unsure whether this is a bug or not, so many tests rely on the fact that we expect type that isnt decayed... I probably shouldn't touch anything for now. I just don't see the line that we need to cross to diagnose original value instead of decayed type.

https://github.com/llvm/llvm-project/pull/183616