Pass current thread as argument to alloc instrumentation.

Avoids recomputation in the hot allocation path when instrumentation is
enabled.

Change-Id: Ic6e7d7d0744f4756787f75d21fddd3c50280b588
diff --git a/runtime/debugger.h b/runtime/debugger.h
index 3e16288..219210e 100644
--- a/runtime/debugger.h
+++ b/runtime/debugger.h
@@ -561,7 +561,7 @@
   /*
    * Recent allocation tracking support.
    */
-  static void RecordAllocation(mirror::Class* type, size_t byte_count)
+  static void RecordAllocation(Thread* self, mirror::Class* type, size_t byte_count)
       LOCKS_EXCLUDED(Locks::alloc_tracker_lock_)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   static void SetAllocTrackingEnabled(bool enabled) LOCKS_EXCLUDED(Locks::alloc_tracker_lock_);