A version of this macro is present in most code-bases. The use of this macro
must satisfy two requirements:
1: If reached, the process must be terminated in all runtime modes and at all
optimization levels.
2: If the compiler requires a value to be returned from the function,
encountering this macro should not make the compiler insist on a return value
(since the process is about to die anyway).
We used to have a version of this macro that wasn't widely used and didn't
satisfy the two requirements. I have removed the same and another unused macro
in fml/logging.h
Fixes https://github.com/flutter/flutter/issues/68164.
