merge revision(s) 51820: [Backport #11519]
* parse.y (literal_concat_gen, evstr2dstr_gen): keep literal encoding beginning with an interpolation same as the source file encoding. [ruby-core:70703] [Bug #11519]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@52773 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 51820: [Backport #11519]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@52773 b2dd03c8-39d4-4d8f-98ff-823fe69b080e