tweak compiler stats printing

Author: dnolen

src/clj/cljs/util.clj

@@ -139,6 +139,6 @@
     `(if ~enable
        (let [start# (. System (nanoTime))
              ret# ~expr]
-         (debug-prn ~msg ", elapsed time:" (/ (double (- (. System (nanoTime)) start#)) 1000000.0) "msecs")
+         (debug-prn (str ~msg ", elapsed time:") (/ (double (- (. System (nanoTime)) start#)) 1000000.0) "msecs")
          ret#)
        ~expr)))