Move assert.h/assert.cc from runtime/vm to runtime/platform

runtime/bin/dartutils.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 "bin/dartutils.h"
 
 #include "bin/file.h"
+#include "platform/assert.h"
 #include "platform/globals.h"
 
 const char* DartUtils::kDartScheme = "dart:";
 const char* DartUtils::kBuiltinLibURL = "dart:builtin";
 const char* DartUtils::kCoreLibURL = "dart:core";
 const char* DartUtils::kCoreImplLibURL = "dart:coreimpl";
 const char* DartUtils::kCoreNativeWrappersLibURL = "dart:nativewrappers";
 const char* DartUtils::kIdFieldName = "_id";
 
 
@@ skipping 195 matching lines @@
            path, File::PathSeparator(), filename);
 
   free(path);
   char* canonical_filename = File::GetCanonicalPath(absolute_filename);
   if (canonical_filename == NULL) {
     return absolute_filename;
   }
   free(absolute_filename);
   return canonical_filename;
 }