[llvm-bugs] [Bug 48829] New: missing dead code diagnostic

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48829

            Bug ID: 48829
           Summary: missing dead code diagnostic
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tiagomacarios at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

for the following code clang will not emit a diagnostic that that f() is never
called (dead code). msvc emits the diagnostic correctly.

https://godbolt.org/z/Y5n78v
```
void f();

void _(int num) {
    switch (num)
    {
        case 1:
            break;
            f();
    }
}
```

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