merge revision(s) 59161: [Backport #13672]
parse.y: check multibyte char * parse.y (parser_precise_mbclen): check invalid multibyte char at skipping strings following `?x` literal string, not to stuck in a infinite loop. [ruby-core:81746] [Bug #13672]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59241 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 59161: [Backport #13672]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59241 b2dd03c8-39d4-4d8f-98ff-823fe69b080e