Track JS allocations as they arrive with no affection on performance when tracking is switched off

src/serialize.cc

 // 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 563 matching lines @@
       "Runtime::AllocateInOldDataSpace");
   Add(ExternalReference::new_space_high_promotion_mode_active_address(isolate).
       address(),
       UNCLASSIFIED,
       62,
       "Heap::NewSpaceAllocationLimitAddress");
   Add(ExternalReference::allocation_sites_list_address(isolate).address(),
       UNCLASSIFIED,
       63,
       "Heap::allocation_sites_list_address()");
+  Add(ExternalReference::record_object_allocation_function(isolate).address(),
+      UNCLASSIFIED,
+      64,
+      "HeapProfiler::RecordObjectAllocationFromMasm");
 
   // Add a small set of deopt entry addresses to encoder without generating the
   // deopt table code, which isn't possible at deserialization time.
   HandleScope scope(isolate);
   for (int entry = 0; entry < kDeoptTableSerializeEntryCount; ++entry) {
     Address address = Deoptimizer::GetDeoptimizationEntry(
         isolate,
         entry,
         Deoptimizer::LAZY,
         Deoptimizer::CALCULATE_ENTRY_ADDRESS);
-    Add(address, LAZY_DEOPTIMIZATION, 64 + entry, "lazy_deopt");
+    Add(address, LAZY_DEOPTIMIZATION, 65 + entry, "lazy_deopt");
   }
 }
 
 
 ExternalReferenceEncoder::ExternalReferenceEncoder(Isolate* isolate)
     : encodings_(Match),
       isolate_(isolate) {
   ExternalReferenceTable* external_references =
       ExternalReferenceTable::instance(isolate_);
   for (int i = 0; i < external_references->size(); ++i) {
@@ skipping 1252 matching lines @@
 
 bool SnapshotByteSource::AtEOF() {
   if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false;
   for (int x = position_; x < length_; x++) {
     if (data_[x] != SerializerDeserializer::nop()) return false;
   }
   return true;
 }
 
 } }  // namespace v8::internal