vm_method.c: single expression

* vm_method.c (GLOBAL_METHOD_CACHE): make a single expression.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47604 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-09-17

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47605 b2dd03c8-39d4-4d8f-98ff-823fe69b080e