[heap] Disable concurrent marking for cctests that rely on manual GC.

test/cctest/heap/test-array-buffer-tracker.cc

Index: test/cctest/heap/test-array-buffer-tracker.cc
diff --git a/test/cctest/heap/test-array-buffer-tracker.cc b/test/cctest/heap/test-array-buffer-tracker.cc
index a3bb3df68c087259672c26d053f09facdf507456..de0b7b9e9913388e35c752ef28d1fbf6b3585cd7 100644
--- a/test/cctest/heap/test-array-buffer-tracker.cc
+++ b/test/cctest/heap/test-array-buffer-tracker.cc
@@ -114,6 +114,7 @@ TEST(ArrayBuffer_ScavengeAndMC) {
 }
 
 TEST(ArrayBuffer_Compaction) {
+  FLAG_concurrent_marking = false;
   FLAG_stress_incremental_marking = false;
   FLAG_manual_evacuation_candidates_selection = true;
   CcTest::InitializeVM();