Reland Force full GCwhenever CollectAllGarbage is meant to trigger a full GC.

test/cctest/test-threads.cc

Index: test/cctest/test-threads.cc
diff --git a/test/cctest/test-threads.cc b/test/cctest/test-threads.cc
index 12042261f408d3ecffa5b7dfb5577de6aa998c99..0f332a3af7b0dfa2259a23e7c2326414fac617a0 100644
--- a/test/cctest/test-threads.cc
+++ b/test/cctest/test-threads.cc
@@ -97,7 +97,7 @@ class ThreadB : public v8::base::Thread {
           v8::Context::Scope context_scope(context);
 
           // Clear the caches by forcing major GC.
-          CcTest::heap()->CollectAllGarbage(v8::internal::Heap::kNoGCFlags);
+          CcTest::heap()->CollectAllGarbage();
           turn = SECOND_TIME_FILL_CACHE;
           break;
         }