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(parent: c7ecd6a) | patch

Minor fixes to improve regex debugging code.

Minor fixes to improve regex debugging code.

When REG_DEBUG is defined, ensure that an un-filled "struct cnfa"
is all-zeroes, not just that it has nstates == 0. This is mainly
so that looking at "struct subre" structs in gdb doesn't distract
one with a lot of garbage fields during regex compilation.

Adjust some places that print debug output to have suitable fflush
calls afterwards.

In passing, correct an erroneous ancient comment: the concatenation
subre-s created by parsebranch() have op == '.' not ','.

Noted while fooling around with some regex performance improvements.

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