[ruby/psych] Fix loading/parsing regular expressions

This fixes the issue where regular expression would come back slightly
different after going through a YAML load/dump cycle. Because we're used
to having to escape forward slashes in regular expression literals
(because the literal is delimited by slashes), but the deserializer
takes the literal output from `Regexp#inspect` and feeds it as a string
into `Regexp.new`, which expects a string, not a Regexp literal, cycling
did not properly work before this commit.

I've also changed the code to be a bit more readable, I hope this
doesn't affect performance.

https://github.com/ruby/psych/commit/f4dd8dadad

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