Disable stress for some unit test.

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 a51d3012a5a8f3c1929d122f9288bb95d2236e2c..957f131342f0e020443447e5a52298db2e2c5faa 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -626,6 +626,8 @@ THREADED_TEST(UsingExternalAsciiString) {
 
 
 THREADED_TEST(ScavengeExternalString) {
+  i::FLAG_stress_compaction = false;
+  i::FLAG_gc_global = false;
   int dispose_count = 0;
   bool in_new_space = false;
   {
@@ -646,6 +648,8 @@ THREADED_TEST(ScavengeExternalString) {
 
 
 THREADED_TEST(ScavengeExternalAsciiString) {
+  i::FLAG_stress_compaction = false;
+  i::FLAG_gc_global = false;
   int dispose_count = 0;
   bool in_new_space = false;
   {
@@ -2546,6 +2550,8 @@ THREADED_TEST(ApiObjectGroupsCycle) {
 // TODO(mstarzinger): This should be a THREADED_TEST but causes failures
 // on the buildbots, so was made non-threaded for the time being.
 TEST(ApiObjectGroupsCycleForScavenger) {
+  i::FLAG_stress_compaction = false;
+  i::FLAG_gc_global = false;
   HandleScope scope;
   LocalContext env;