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 61abc206e108ec2f85e0ff83393eb778c58dde79..348eada8cdd413ecf4ad829c5d6e76509d82ee1c 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1049,6 +1049,14 @@ class MacroAssembler: public Assembler {
   // ---------------------------------------------------------------------------
   // Allocation support
 
+  void RecordObjectAllocation(Isolate* isolate,
+                              Register object,
+                              Register object_size);
+
+  void RecordObjectAllocation(Isolate* isolate,
+                              Register object,
+                              int object_size);
+
   // Allocate an object in new space or old pointer space. If the given space
   // is exhausted control continues at the gc_required label. The allocated
   // object is returned in result and end of the new object is returned in