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

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 09dae3e09608b248886bd0a7b47a783a9171d25b..486e0b2c2ccf164af307dadd2bd699c8e527dc4d 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1121,6 +1121,16 @@ class MacroAssembler: public Assembler {
                 Label* gc_required,
                 AllocationFlags flags);
 
+  // Record a JS object allocation if allocations tracking
+  // mode is on.
+  void RecordObjectAllocation(Isolate* isolate,
+                              Register object,
+                              Register object_size);
+
+  void RecordObjectAllocation(Isolate* isolate,
+                              Register object,
+                              int object_size);
+
   // Undo allocation in new space. The object passed and objects allocated after
   // it will no longer be allocated. Make sure that no pointers are left to the
   // object(s) no longer allocated as they would be invalid when allocation is