MINOR: debug: add a COUNT() macro which doesn't take a condition

MINOR: debug: add a COUNT() macro which doesn't take a condition

Most of the COUNT_IF() calls are placed in locations where they're not
part of a condition, but we just want to count one pass at a specific
location (e.g. branch of an "if" or after a label, etc). In such cases
it's systematically written as COUNT_IF(1, ...), but it's ugly, adds
bytes in the code, and needlessly clobbers the output.

Let's introduce a new variant COUNT() which doesn't require a condition
and only counts the number of passes. This is possible since COUNT_GLITCH
was introduced and already unlocked the ability to write messages without
conditions, so let's just exploit this.