merge revision(s) 67167: [Backport #15635]
string.c: respect the actual encoding * string.c (rb_enc_str_coderange): respect the actual encoding of if a BOM presents, and scan for the actual code range. [ruby-core:91662] [Bug #15635]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 67167: [Backport #15635]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e