Add code for CPU feature detection and use it to detect SSE3 and SSE 4.1.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 637 matching lines @@
   }
 
   if (has_help_option) {
     PrintUsage();
     return 0;
   }
 
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
   // Initialize the Dart VM.
-  Dart_Initialize(CreateIsolateAndSetup,
-                  NULL,
-                  ShutdownIsolate);
+  if (!Dart_Initialize(CreateIsolateAndSetup,
+                       NULL,
+                       ShutdownIsolate)) {
+    return ErrorExit("VM initialization failed\n");
+  }
 
   DartUtils::SetOriginalWorkingDirectory();
 
   // Call CreateIsolateAndSetup which creates an isolate and loads up
   // the specified application script.
   char* error = NULL;
   char* isolate_name = BuildIsolateName(script_name, "main");
   if (!CreateIsolateAndSetupHelper(script_name,
                                    "main",
                                    true,  // Canonicalize the script name.
@@ skipping 61 matching lines @@
   Dart_ExitScope();
   // Dump symbol information for the profiler.
   DumpPprofSymbolInfo();
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   // Terminate process exit-code handler.
   Process::TerminateExitCodeHandler();
 
   return 0;
 }