* lisp/progmodes/perl-mode.el: Use syntax-ppss; fix one indentation case.

* lisp/progmodes/perl-mode.el: Use syntax-ppss; fix one indentation case.
(perl-indent-line): Use syntax-ppss to detect we're in a doc-section.
(perl-continuation-line-p): Don't skip over anything else than labels.
Return the previous char.
(perl-calculate-indent): Use syntax-ppss instead of parse-start
and update callers accordingly.  For continuation lines, check the
the case of array hashes.
(perl-backward-to-noncomment): Make it non-interactive.
(perl-backward-to-start-of-continued-exp): Rewrite.
* test/indent/perl.perl: Add indentation pattern for hash-table entries.