regcomp.c: disambiguate "parse_start" and related var names

This was originally done to make the cleanup of the offsets debug logic
easier to follow and understand. 'parse_start' was heavily used in
multiple functions, and given the size of the functions in regcomp.c
it was often not clear which parse_start was which. 'oregcomp_parse'
was also used in a similar way.

This patch disambiguates them all so they are all uniquely named
and relevant to the code they operate on and of the form
"thing_parse_start", (or "thing_parse_start_const" where both were in
use).

0 files changed, 0 insertions, 0 deletions