merge revision(s) 38213: [Backport #7629]

	* vm.c (rb_vm_make_proc): save the proc made from the given block so
	  that it will not get collected.  [ruby-core:50545] [Bug #7507]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@38726 b2dd03c8-39d4-4d8f-98ff-823fe69b080e