MEDIUM: debug: merge the counter and message emission into complain()

MEDIUM: debug: merge the counter and message emission into complain()

The event counter in debug mode moved to complain_with_dbg(). This
ensures that the deferencing of the counter, the atomic ops, the
condition to skip the emission are all centralized and are no longer
inline in the BUG_ON() location.

The trace emission that was now systematic after calls to complain*()
now moved to the shared _complain(), where it is emitted based on the
elements present in the details passed to the function (fatal/warning).

This saves another 56kB, so we're at -193kB compared to initial work.
The total preprocessor output is now ~7% smaller in bytes than initial
work, and ~10% in words, and builds ~7% faster (7.05s vs 7.55s before
on a 64-core EPYC). The part of the reasonable cleanup is now done.

However the complain_with_dbg function now appears in the caller's
stack as tail jumps are not always done, but we have plans for this.