[llvm-bugs] [Bug 133509] musttail attribute on a function with not_tail_called attribute has no warning/error that musttail is ignored

[LLVM Bugs via llvm-bugs]

Issue	133509
Summary	musttail attribute on a function with not_tail_called attribute has no warning/error that musttail is ignored
Labels	new issue
Assignees
Reporter	pinskia

    Take:
```
int __attribute__((not_tail_called)) foo1(int);

int foo2(int a) {
 [[clang::musttail]]
  return foo1(a);
}
```

There is NO diagnostic saying musttail is being ignored due to the conflict of not_tail_called attribute.

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