[Interpreter] Enable tracing of bytecode handler dispatches.

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1054 matching lines @@
 
 ExternalReference ExternalReference::isolate_address(Isolate* isolate) {
   return ExternalReference(isolate);
 }
 
 ExternalReference ExternalReference::interpreter_dispatch_table_address(
     Isolate* isolate) {
   return ExternalReference(isolate->interpreter()->dispatch_table_address());
 }
 
+ExternalReference ExternalReference::interpreter_dispatch_counters(
+    Isolate* isolate) {
+  return ExternalReference(
+      isolate->interpreter()->bytecode_dispatch_count_table());
+}
+
 ExternalReference::ExternalReference(StatsCounter* counter)
   : address_(reinterpret_cast<Address>(counter->GetInternalPointer())) {}
 
 
 ExternalReference::ExternalReference(Isolate::AddressId id, Isolate* isolate)
   : address_(isolate->get_address_from_id(id)) {}
 
 
 ExternalReference::ExternalReference(const SCTableReference& table_ref)
   : address_(table_ref.address()) {}
@@ skipping 992 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8