Copy-on-write arrays.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 836ed74994f2d21ed2b9e843f5052d5d84c6e23d..7843f006e68c9358f088dfa630dbdb9cd5336e9a 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -597,6 +597,7 @@ class MacroAssembler: public Assembler {
   // Use --debug_code to enable.
   void Assert(Condition cc, const char* msg);
   void AssertRegisterIsRoot(Register reg, Heap::RootListIndex index);
+  void AssertFastElements(Register elements);
 
   // Like Assert(), but always enabled.
   void Check(Condition cc, const char* msg);