Revert of [heap] Do not invoke GC to make heap iterable.

test/cctest/test-log.cc

Index: test/cctest/test-log.cc
diff --git a/test/cctest/test-log.cc b/test/cctest/test-log.cc
index f5806c411817238fd35a9c1b51a590c51cc93386..c3856f2c43f968edcedc82583023eff3ce59f36e 100644
--- a/test/cctest/test-log.cc
+++ b/test/cctest/test-log.cc
@@ -485,6 +485,8 @@
         "    (function a(j) { return function b() { return j; } })(100);\n"
         "})(this);");
     logger->StopProfiler();
+    reinterpret_cast<i::Isolate*>(isolate)->heap()->CollectAllGarbage(
+        i::Heap::kMakeHeapIterableMask);
     logger->StringEvent("test-logging-done", "");
 
     // Iterate heap to find compiled functions, will write to log.