* test/ruby/test_gc.rb: catch up last commit.
  Now RUBY_GC_OLDSPACE_LIMIT(...) is RUBY_GC_OLDMALLOC_LIMIT(...).



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43834 b2dd03c8-39d4-4d8f-98ff-823fe69b080e