Add back alpha atrace log

bug:20922838

Change-Id: I70ccbffdd5f140cd1dd71fbf456fb5b085e74a4a
diff --git a/libs/hwui/utils/TraceUtils.h b/libs/hwui/utils/TraceUtils.h
index ff8ccb8..ddc272c 100644
--- a/libs/hwui/utils/TraceUtils.h
+++ b/libs/hwui/utils/TraceUtils.h
@@ -35,7 +35,7 @@
     };
 
     static void atraceFormatBegin(const char* fmt, ...) {
-        if (CC_UNLIKELY(!ATRACE_ENABLED())) return;
+        if (CC_LIKELY(!ATRACE_ENABLED())) return;
 
         const int BUFFER_SIZE = 256;
         va_list ap;