merge revision(s) 37661: [Backport #7633]

	* vm_exec.h (GENTRY): GENTRY should be pointer size.
	  A patch by yoshidam (Yoshida Masato) [Bug #7332].


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@38779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e