merge revision(s) r46585,r46595,r46822: [Backport #9977] [Backport #9978] [Backport #9983]

	test_env.rb: rehearsal

	* test/ruby/test_env.rb (test_memory_leak_{aset,select,shift}):
  have a rehearsal before the main loop.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@47056 b2dd03c8-39d4-4d8f-98ff-823fe69b080e