merge revision(s) 53724: [Backport #11946]
* string.c (str_new_frozen): if the given string is embeddedable but not embedded, embed a new copied string. [Bug #11946]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54416 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 53724: [Backport #11946]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54416 b2dd03c8-39d4-4d8f-98ff-823fe69b080e