https://bugs.llvm.org/show_bug.cgi?id=52225

            Bug ID: 52225
           Summary: Incorrect and missing tautological warnings with
                    consteval if
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2b
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected]

The following consteval if statements produce tautological warnings that don't
seem correct in all cases.
```
constexpr void f() {
  if consteval {
    if consteval { // Correct diagnostic
    }
    if !consteval { // Incorrect diagnostic
    }
  }

  if !consteval {
    if consteval { // Missing diagnostic
    }
    if !consteval { // Missing diagnostic
    }
  }
}
```
https://godbolt.org/z/6KjW4v5dn

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