[heap] Pause black allocation during GCs

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index 856819d37df7a40b5dea7dc79b65bbf18e2ecab7..b5d023512f2c62609862ea02c2c84af4753fe9b8 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -573,6 +573,19 @@ void IncrementalMarking::StartBlackAllocation() {
   }
 }
 
+void IncrementalMarking::PauseBlackAllocation() {
+  DCHECK(FLAG_black_allocation);
+  DCHECK(IsMarking());
+  heap()->old_space()->UnmarkAllocationInfo();
+  heap()->map_space()->UnmarkAllocationInfo();
+  heap()->code_space()->UnmarkAllocationInfo();
+  if (FLAG_trace_incremental_marking) {
+    heap()->isolate()->PrintWithTimestamp(
+        "[IncrementalMarking] Black allocation paused\n");
+  }
+  black_allocation_ = false;
+}
+
 void IncrementalMarking::FinishBlackAllocation() {
   if (black_allocation_) {
     black_allocation_ = false;