Collect and output a few dex2oat statistics.

Not sure how useful this is. Suggestions welcome.

Change-Id: I339de66a9964d18b11a482f549e891a57831e10e
diff --git a/src/utils.cc b/src/utils.cc
index dbbca28..531424e 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -115,6 +115,10 @@
 #endif
 }
 
+uint64_t NsToMs(uint64_t ns) {
+  return ns/1000/1000;
+}
+
 std::string PrettyDescriptor(const String* java_descriptor) {
   if (java_descriptor == NULL) {
     return "null";