merge revision(s) 52016,52017,52019,52020,52021: [Backport #10735]
* enc/euc_jp.c (mbc_case_fold): check given string is valid or not, and if invalid, return 1. [Bug #11486]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@52652 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 52016,52017,52019,52020,52021: [Backport #10735]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@52652 b2dd03c8-39d4-4d8f-98ff-823fe69b080e