merge revision(s) 41389: [Backport #8540]

	* vm_insnhelper.c (vm_call_method): ensure methods of type
	  VM_METHOD_TYPE_ATTR_SET are called with 1 argument

	* test/ruby/test_module.rb (class TestModule): add test
	[ruby-core:55543] [Bug #8540]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41395 b2dd03c8-39d4-4d8f-98ff-823fe69b080e