Support full deoptimization during GC via stack guard.

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1480 matching lines @@
   // Adjusts the amount of registered external memory.
   // Returns the adjusted value.
   inline intptr_t AdjustAmountOfExternalAllocatedMemory(
       intptr_t change_in_bytes);
 
   // Allocate uninitialized fixed array.
   MUST_USE_RESULT MaybeObject* AllocateRawFixedArray(int length);
   MUST_USE_RESULT MaybeObject* AllocateRawFixedArray(int length,
                                                      PretenureFlag pretenure);
 
+  // Predicate that governs global pre-tenuring decisions based on observed
+  // promotion rates of previous collections.
+  inline bool ShouldGloballyPretenure() {
+    return new_space_high_promotion_mode_active_;
+  }
+
   inline intptr_t PromotedTotalSize() {
     return PromotedSpaceSizeOfObjects() + PromotedExternalMemorySize();
   }
 
   // True if we have reached the allocation limit in the old generation that
   // should force the next GC (caused normally) to be a full one.
   inline bool OldGenerationPromotionLimitReached() {
     return PromotedTotalSize() > old_gen_promotion_limit_;
   }
 
@@ skipping 1519 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_