This was likely an unintentional behavior change made a while ago while trying to reduce duplication.  The new behavior will always include the unexpanded macro in the error string.  For example, `CHECK_EQ(MACRO(x), MACRO(y))` will now output "MACRO(x) == MACRO(y)" if it fails.  Before this change, CHECK and QCHECK were the only macros that had this behavior.

Not using function-like macro aliases is a possible alternative here, but unfortunately that would flood the macro namespace downstream with CHECK* and break existing code.

PiperOrigin-RevId: 495138582
Change-Id: I6a1afd89a6b9334003362e5d3e55da68f86eec98