A64: Synchronize with r15204.

test/cctest/test-mark-compact.cc

Index: test/cctest/test-mark-compact.cc
diff --git a/test/cctest/test-mark-compact.cc b/test/cctest/test-mark-compact.cc
index 45cb39c07e3c581e18847339d409a3515a1a6f28..3a6b0428e5c8e8d8dc521685bf6a99502d5ef0c8 100644
--- a/test/cctest/test-mark-compact.cc
+++ b/test/cctest/test-mark-compact.cc
@@ -283,6 +283,7 @@ static void GCEpilogueCallbackFunc() {
 
 
 TEST(GCCallback) {
+  i::FLAG_stress_compaction = false;
   CcTest::InitializeVM();
 
   HEAP->SetGlobalGCPrologueCallback(&GCPrologueCallbackFunc);
@@ -557,7 +558,7 @@ TEST(BootUpMemoryUse) {
       }
     } else {                            // 32-bit.
       if (v8::internal::Snapshot::IsEnabled()) {
-        CHECK_LE(delta, 2900 * 1024);
+        CHECK_LE(delta, 2910 * 1024);
       } else {
         CHECK_LE(delta, 3400 * 1024);
       }