Removed a bunch of GetExistingThreadLocal calls by threading the Isolate.

src/ic-inl.h

 // 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 25 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 
 Address IC::address() const {
   // Get the address of the call.
   Address result = Assembler::target_address_from_return_address(pc());
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
-  Debug* debug = Isolate::Current()->debug();
+  ASSERT(Isolate::Current() == isolate());
+  Debug* debug = isolate()->debug();
   // First check if any break points are active if not just return the address
   // of the call.
   if (!debug->has_break_points()) return result;
 
   // At least one break point is active perform additional test to ensure that
   // break point locations are updated correctly.
   if (debug->IsDebugBreak(Assembler::target_address_at(result))) {
     // If the call site is a call to debug break then return the address in
     // the original code instead of the address in the running code. This will
     // cause the original code to be updated and keeps the breakpoint active in
@@ skipping 74 matching lines @@
 JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) {
   Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
   ASSERT(map_owner->IsJSObject());
   return JSObject::cast(map_owner);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_INL_H_