Add back native tracing to optimized code. Tracing natives is an important part of perfromance analysis and should therefore be available in optiumized VM as well. No performance implications are expected.

R=asiva@google.com

Review URL: https://codereview.chromium.org//27226002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28614 260f80e4-7a28-3924-810f-c04153c831b5

runtime/vm/native_arguments.h

@@ -48,10 +48,6 @@ class Simulator;
     VerifyPointersVisitor::VerifyPointers();                                   \
     Isolate::Current()->heap()->Verify();                                      \
   }
-#define TRACE_NATIVE_CALL(format, name)                                        \
-  if (FLAG_trace_natives) {                                                    \
-    OS::Print("Calling native: " format "\n", name);                           \
-  }
 #define DEOPTIMIZE_ALOT                                                        \
   if (FLAG_deoptimize_alot) {                                                  \
     DeoptimizeAll();                                                           \
@@ -61,11 +57,15 @@ class Simulator;
 
 #define CHECK_STACK_ALIGNMENT { }
 #define VERIFY_ON_TRANSITION { }
-#define TRACE_NATIVE_CALL(format, name) { }
 #define DEOPTIMIZE_ALOT { }
 
 #endif
 
+#define TRACE_NATIVE_CALL(format, name)                                        \
+  if (FLAG_trace_natives) {                                                    \
+    OS::Print("Calling native: " format "\n", name);                           \
+  }
+
 
 // Class NativeArguments is used to access arguments passed in from
 // generated dart code to a runtime function or a dart library native