bug#11663: Incorrect regexp match with explicitly numbered blocks

Thanks for the report.  The problem was that at_begline_loc_p wasn't
updated when the `(?N:' syntax was added.  I have also fixed a problem
with preceding backslashes that causes the ^ in patterns like "\\\\(^a)"
to be incorrectly taken non-literally.

Andreas.

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Andreas Schwab, schwab <at> linux-m68k.org
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