Removed ThreadLocalVar test that depended on forcing GC.

Author: jdantonio

spec/concurrent/atomic/semaphore_spec.rb

@@ -50,27 +50,6 @@ module Concurrent
           var.value = 0
           expect(var.instance_variable_get(:@storage).keys.size).to be == 1
         end
-
-        # TODO this test is really bad, but better than nothing. 
-        it 'does not leave values behind when bind is not used' do
-          # TODO find out why it fails from the begging sometimes, hence the 3 tries
-          tries = Array.new(3) do
-            var = ThreadLocalVar.new(0)
-            10.times.map do |i|
-              Thread.new { var.value = i; var.value }
-            end.each(&:join)
-            var.value = 0
-            # TODO find out why long sleep is necessary, does it take longer for threads to be collected?
-            sleep 1
-            if rbx?
-              GC.run true # force GC run
-            else
-              GC.start
-            end
-            var.instance_variable_get(:@storage).keys.size
-          end
-          expect(tries.any? { |v| v == 1 }).to be_truthy
-        end
       end
     end