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

runtime/vm/scopes_test.cc

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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 "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/ast.h"
 #include "vm/scopes.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 static const intptr_t kPos = 1;  // Dummy token index in non-existing source.
 
 
 TEST_CASE(LocalScope) {
@@ skipping 88 matching lines @@
          (inner_scope1->VariableAt(1) == var_b));
   EXPECT((inner_scope2->VariableAt(0) == var_a) ||
          (inner_scope2->VariableAt(1) == var_a) ||
          (inner_scope2->VariableAt(2) == var_a));
   EXPECT((inner_scope2->VariableAt(0) == var_c) ||
          (inner_scope2->VariableAt(1) == var_c) ||
          (inner_scope2->VariableAt(2) == var_c));
 }
 
 }  // namespace dart