Do not require dexopt when previous profile does not exist

Also turn down some dex2oat related noise

Bug: 14184659
Change-Id: I134890f2c452d7f85ca4b736b5724f42533c2a7f
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index ac76c35..d4ad3c6 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -909,7 +909,6 @@
       profile_file = option.substr(strlen("--profile-file=")).data();
       VLOG(compiler) << "dex2oat: profile file is " << profile_file;
     } else if (option == "--no-profile-file") {
-      LOG(INFO) << "dex2oat: no profile file supplied (explictly)";
       // No profile
     } else if (option == "--print-pass-names") {
       PassDriver::PrintPassNames();
@@ -1079,7 +1078,7 @@
   }
 
   timings.StartSplit("dex2oat Setup");
-  LOG(INFO) << "dex2oat: " << CommandLine();
+  LOG(INFO) << CommandLine();
 
   Runtime::Options runtime_options;
   std::vector<const DexFile*> boot_class_path;