Add generated code for ascii string comparison...

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
===================================================================
--- src/ia32/assembler-ia32.h	(revision 3568)
+++ src/ia32/assembler-ia32.h	(working copy)
@@ -540,7 +540,7 @@
   void cmov(Condition cc, Register dst, Handle<Object> handle);
   void cmov(Condition cc, Register dst, const Operand& src);
 
-  // Repetitive moves.
+  // Repetitive string instructions.
   void rep_movs();
 
   // Exchange two registers
@@ -617,6 +617,7 @@
   void shr_cl(Register dst);
 
   void subb(const Operand& dst, int8_t imm8);
+  void subb(Register dst, const Operand& src);
   void sub(const Operand& dst, const Immediate& x);
   void sub(Register dst, const Operand& src);
   void sub(const Operand& dst, Register src);
@@ -675,6 +676,9 @@
   void j(Condition cc, byte* entry, RelocInfo::Mode rmode, Hint hint = no_hint);
   void j(Condition cc, Handle<Code> code, Hint hint = no_hint);
 
+  // Loop instruction using ecx as counter.
+  void loope(Label* L);
+
   // Floating-point operations
   void fld(int i);