* lisp/progmodes/ruby-mode.el (ruby-move-to-block): Improve

* lisp/progmodes/ruby-mode.el (ruby-move-to-block): Improve
performance.  Instead of recalculating indentation fully for each
line, sum up indentation depth based only on visited lines.
(ruby-parse-partial): Increase the depth after "do" even when END
is right after it.
(ruby-parse-partial): When END is in the middle of a percent
literal, increase the depth if the delimiter chars belong to the
paren syntax class.

* test/automated/ruby-mode-tests.el
(ruby-move-to-block-skips-percent-literal): New test.