merge revision(s) r45364,r45395,r45396,r45403,r45406: [Backport #9652]

	* time.c (time_mload): freeze and preserve marshal-loaded time zone

	* test/ruby/test_time.rb: add test for GC on loaded object
	  [Bug #9652]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46304 b2dd03c8-39d4-4d8f-98ff-823fe69b080e