Do not update survival rate if the new space size is zero.

BUG=v8:2333
LOG=N
R=hpayer@chromium.org

Review URL: https://chromiumcodereview.appspot.com/48443002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17753 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -939,6 +939,8 @@ void Heap::ClearNormalizedMapCaches() {
 
 
 void Heap::UpdateSurvivalRateTrend(int start_new_space_size) {
+  if (start_new_space_size == 0) return;
+
   double survival_rate =
       (static_cast<double>(young_survivors_after_last_gc_) * 100) /
       start_new_space_size;

test/cctest/test-api.cc

@@ -17131,6 +17131,14 @@ TEST(Regress2107) {
   CHECK_LT(final_size, initial_size + 1);
 }
 
+
+TEST(Regress2333) {
+  LocalContext env;
+  for (int i = 0; i < 3; i++) {
+    CcTest::heap()->PerformScavenge();
+  }
+}
+
 static uint32_t* stack_limit;
 
 static void GetStackLimitCallback(