Add ability to disable inline bump-pointer allocation.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index eea94f892dea403e7cbdd79161102acb115b7023..8c488e19e17c0c034bf93f3f8a5a57789d902ab4 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1546,6 +1546,13 @@ class Heap {
     return Min(limit, halfway_to_the_max);
   }
 
+  // Indicates whether inline bump-pointer allocation has been disabled.
+  bool inline_allocation_disabled() { return inline_allocation_disabled_; }
+
+  // Switch whether inline bump-pointer allocation should be used.
+  void EnableInlineAllocation();
+  void DisableInlineAllocation();
+
   // Implements the corresponding V8 API function.
   bool IdleNotification(int hint);
 
@@ -1992,6 +1999,10 @@ class Heap {
   // last GC.
   bool old_gen_exhausted_;
 
+  // Indicates that inline bump-pointer allocation has been globally disabled
+  // for all spaces. This is used to disable allocations in generated code.
+  bool inline_allocation_disabled_;
+
   // Weak list heads, threaded through the objects.
   // List heads are initilized lazily and contain the undefined_value at start.
   Object* native_contexts_list_;