Avoid suspending for alloc trace enabling when already suspended.

Bug: 17499772

(cherry picked from commit 1d6ee090fddd4bfd35c304d6ceb929d5c529dfcc)

Change-Id: Id09809c476c685f0a197ee75bb08638931364efd
diff --git a/runtime/runtime.h b/runtime/runtime.h
index cfb1abc..f9c017b 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -390,7 +390,7 @@
 
   void ResetStats(int kinds);
 
-  void SetStatsEnabled(bool new_state);
+  void SetStatsEnabled(bool new_state, bool suspended);
 
   enum class NativeBridgeAction {  // private
     kUnload,