[clang] [clang][Sema] Add diagnostic note for reference of function-like macros requiring without parentheses (PR #123495)

[via cfe-commits]

https://github.com/Sirraide commented:

The tests are in the wrong directory (you’ve added them to a file in 
`test/Preprocessor`, but this is a Sema change so the test should probably be 
in `test/Sema`).

Additionally, a test involving typo correction would probably be a good idea:
```c
#define FOO1() 
void f() {
    int FOO;
    int x = FOO1; // Typo correction to 'FOO' instead of note about 'FOO1()'.
}
```

https://github.com/llvm/llvm-project/pull/123495
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