[heap] Use RAIL mode for initial heap sizing

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index bbf2f98875b417ecf2dcf0f2a605f0c6de26caef..dce2d52ade91974e85600fb17a9291cd36236ef6 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -18172,9 +18172,15 @@ TEST(RecursionWithSourceURLInMessageScriptResourceNameOrSourceURL) {
 static void CreateGarbageInOldSpace() {
   i::Factory* factory = CcTest::i_isolate()->factory();
   v8::HandleScope scope(CcTest::isolate());
-  i::AlwaysAllocateScope always_allocate(CcTest::i_isolate());
-  for (int i = 0; i < 1000; i++) {
-    factory->NewFixedArray(1000, i::TENURED);
+  {
+    i::AlwaysAllocateScope always_allocate(CcTest::i_isolate());
+    for (int i = 0; i < 1000; i++) {
+      factory->NewFixedArray(1000, i::TENURED);
+    }
+  }
+  CcTest::CollectAllGarbage(i::Heap::kFinalizeIncrementalMarkingMask);
+  if (CcTest::heap()->mark_compact_collector()->sweeping_in_progress()) {
+    CcTest::heap()->mark_compact_collector()->EnsureSweepingCompleted();
   }
 }