Faster filling newly allocated arrays with the holes from the Array construction stub.

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index ce07dd790fb125f383905352a1eb18d6accaf573..4497e2aa70a0ee710eac89e7a79e1d1331fa7385 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -542,8 +542,12 @@ class Assembler : public Malloced {
   void cmov(Condition cc, Register dst, Handle<Object> handle);
   void cmov(Condition cc, Register dst, const Operand& src);
 
+  // Flag management.
+  void cld();
+
   // Repetitive string instructions.
   void rep_movs();
+  void rep_stos();
 
   // Exchange two registers
   void xchg(Register dst, Register src);