Changing string length field type from int to SMI. It will make it be a regu...

src/objects-inl.h

Index: src/objects-inl.h
===================================================================
--- src/objects-inl.h	(revision 4579)
+++ src/objects-inl.h	(working copy)
@@ -1651,7 +1651,7 @@
 INT_ACCESSORS(Array, length, kLengthOffset)
 
 
-INT_ACCESSORS(String, length, kLengthOffset)
+SMI_ACCESSORS(String, length, kLengthOffset)
 
 
 uint32_t String::hash_field() {
@@ -1773,14 +1773,12 @@
 
 
 int SeqTwoByteString::SeqTwoByteStringSize(InstanceType instance_type) {
-  uint32_t length = READ_INT_FIELD(this, kLengthOffset);
-  return SizeFor(length);
+  return SizeFor(length());
 }
 
 
 int SeqAsciiString::SeqAsciiStringSize(InstanceType instance_type) {
-  uint32_t length = READ_INT_FIELD(this, kLengthOffset);
-  return SizeFor(length);
+  return SizeFor(length());
 }