Copy-on-write arrays.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 0b16f0d40b01b3f72a299f16eba999417cdf972b..c23f6873a1cd9b2de009f12d219674792962d751 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -508,6 +508,8 @@ class MacroAssembler: public Assembler {
   // Use --debug_code to enable.
   void Assert(Condition cc, const char* msg);
 
+  void AssertFastElements(Register elements);
+
   // Like Assert(), but always enabled.
   void Check(Condition cc, const char* msg);