Flat string reader

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 21308d49006106a2640f6895adffb4c7802402cb..d3de7f22993997202c1d25c765246dc2ead63f9a 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -279,6 +279,16 @@ bool StringShape::IsExternalTwoByte() {
 }
 
 
+uc32 FlatStringReader::Get(int index) {
+  ASSERT(0 <= index && index <= length_);
+  if (is_ascii_) {
+    return static_cast<const byte*>(start_)[index];
+  } else {
+    return static_cast<const uc16*>(start_)[index];
+  }
+}
+
+
 bool Object::IsNumber() {
   return IsSmi() || IsHeapNumber();
 }