profiler: wrap all logging with the debugLog helper function

debugLog checks user defined logging options before logging.

Change-Id: I702b78ab6d4d8df2407c432e9eb4570c92dfce35
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/42130
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Kalyana Chadalavada <kchadalavada@google.com>
diff --git a/profiler/profiler.go b/profiler/profiler.go
index 5d7a9f9..7896363 100644
--- a/profiler/profiler.go
+++ b/profiler/profiler.go
@@ -188,7 +188,7 @@
 			o.done = 1
 		}
 	} else {
-		log.Printf("profiler.Start() called again after it was previously called")
+		debugLog("profiler.Start() called again after it was previously called")
 		err = nil
 	}
 	return err