Change halfway-to-the-max GC trigger to measure committed pages, not allocated objects

src/heap/heap-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_INL_H_
 #define V8_HEAP_HEAP_INL_H_
 
 #include <cmath>
 
 #include "src/base/platform/platform.h"
@@ skipping 331 matching lines @@
 }
 
 
 bool Heap::InOldDataSpace(Object* object) {
   return InOldDataSpace(reinterpret_cast<Address>(object));
 }
 
 
 bool Heap::OldGenerationAllocationLimitReached() {
   if (!incremental_marking()->IsStopped()) return false;
-  return OldGenerationSpaceAvailable() < 0;
+  return OldGenerationSpaceAvailable() < 0 ||
+         old_generation_committed_memory_limit_ <
+             CommittedOldGenerationMemory();
 }
 
 
 bool Heap::ShouldBePromoted(Address old_address, int object_size) {
   NewSpacePage* page = NewSpacePage::FromAddress(old_address);
   Address age_mark = new_space_.age_mark();
   return page->IsFlagSet(MemoryChunk::NEW_SPACE_BELOW_AGE_MARK) &&
          (!page->ContainsLimit(age_mark) || old_address < age_mark);
 }
 
@@ skipping 370 matching lines @@
 
 void VerifySmisVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     CHECK((*current)->IsSmi());
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_INL_H_