Intrinsify String.charCodeAt, String.length and String.hashCode. Improves frog performance by 2x.

runtime/vm/object.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "vm/assert.h"
 #include "vm/dart.h"
 #include "vm/globals.h"
@@ skipping 2481 matching lines @@
   HEAP_OBJECT_IMPLEMENTATION(String, Instance);
 };
 
 
 class OneByteString : public String {
  public:
   virtual int32_t CharAt(intptr_t index) const {
     return *CharAddr(index);
   }
 
+  static intptr_t data_offset() { return OFFSET_OF(RawOneByteString, data_); }
+
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawOneByteString) == OFFSET_OF(RawOneByteString, data_));
     return 0;
   }
 
   static intptr_t InstanceSize(intptr_t len) {
     return RoundedAllocationSize(sizeof(RawOneByteString) + len);
   }
 
   static RawOneByteString* New(intptr_t len,
@@ skipping 475 matching lines @@
 }
 
 
 void Context::SetAt(intptr_t index, const Instance& value) const {
   StorePointer(InstanceAddr(index), value.raw());
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_