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

runtime/vm/dart_entry_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 "platform/assert.h"
 #include "vm/assembler.h"
-#include "vm/assert.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/object.h"
 #include "vm/resolver.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 // Only ia32 and x64 can run execution tests.
 #if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
@@ skipping 22 matching lines @@
   const Smi& retval = Smi::Handle(
       reinterpret_cast<RawSmi*>(DartEntry::InvokeStatic(function,
                                                         arguments,
                                                         kNoArgumentNames)));
   EXPECT_EQ(Smi::New(42), retval.raw());
 }
 
 #endif  // TARGET_ARCH_IA32 || TARGET_ARCH_X64.
 
 }  // namespace dart