merge revision(s) 61862: [Backport #14368]
parse.y (new_regexp): Fix SEGV of `/#{"\u3042"}#{'?'}/` in non UTF-8 Mixing other encoding string literals in one Regexp caused SEGV. This bug was found by CoverityScan.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@62539 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 61862: [Backport #14368]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@62539 b2dd03c8-39d4-4d8f-98ff-823fe69b080e