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merge revision(s) 45364,45395,45396,45403,45406: [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_0_0@45752 b2dd03c8-39d4-4d8f-98ff-823fe69b080e