escape.c: should not freeze
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53234 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
escape.c: should not freeze
should return unfrozen new string.
[ruby-core:72426] [Bug #11858]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53234 b2dd03c8-39d4-4d8f-98ff-823fe69b080e