Merged r11143, r11162, r11174, r11208, r11213, r11222 into 3.9 branch.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index defe352614b7268db819aadcd011890bd7b79e34..57b223fa6ab33fddab76e4ebfa49ce2de9612ffb 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -1198,13 +1198,15 @@ MaybeObject* NewSpace::SlowAllocateRaw(int size_in_bytes) {
         allocation_info_.limit + inline_allocation_limit_step_,
         high);
     int bytes_allocated = static_cast<int>(new_top - top_on_previous_step_);
-    heap()->incremental_marking()->Step(bytes_allocated);
+    heap()->incremental_marking()->Step(
+        bytes_allocated, IncrementalMarking::GC_VIA_STACK_GUARD);
     top_on_previous_step_ = new_top;
     return AllocateRaw(size_in_bytes);
   } else if (AddFreshPage()) {
     // Switched to new page. Try allocating again.
     int bytes_allocated = static_cast<int>(old_top - top_on_previous_step_);
-    heap()->incremental_marking()->Step(bytes_allocated);
+    heap()->incremental_marking()->Step(
+        bytes_allocated, IncrementalMarking::GC_VIA_STACK_GUARD);
     top_on_previous_step_ = to_space_.page_low();
     return AllocateRaw(size_in_bytes);
   } else {