Revert "Changing string length field type from int to SMI."

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index c749d506924423e9ec11b7aa25f17431a24c4f6a..7a9bcf0ea30b97399070e4e1fc5de3e32fcb2624 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -901,9 +901,7 @@ void MacroAssembler::AllocateTwoByteString(Register result,
   // Set the map, length and hash field.
   mov(FieldOperand(result, HeapObject::kMapOffset),
       Immediate(Factory::string_map()));
-  mov(scratch1, length);
-  SmiTag(scratch1);
-  mov(FieldOperand(result, String::kLengthOffset), scratch1);
+  mov(FieldOperand(result, String::kLengthOffset), length);
   mov(FieldOperand(result, String::kHashFieldOffset),
       Immediate(String::kEmptyHashField));
 }
@@ -936,9 +934,7 @@ void MacroAssembler::AllocateAsciiString(Register result,
   // Set the map, length and hash field.
   mov(FieldOperand(result, HeapObject::kMapOffset),
       Immediate(Factory::ascii_string_map()));
-  mov(scratch1, length);
-  SmiTag(scratch1);
-  mov(FieldOperand(result, String::kLengthOffset), scratch1);
+  mov(FieldOperand(result, String::kLengthOffset), length);
   mov(FieldOperand(result, String::kHashFieldOffset),
       Immediate(String::kEmptyHashField));
 }