Adapt Danno's Track Allocation Info idea to fast literals. When allocating a literal array,

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 454e64523b981955756c1dbf456cd85edfa841be..d1b94cd949f6ee13558deff1e1c74914cedd7093 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -1309,6 +1309,16 @@ class MacroAssembler: public Assembler {
   // in r0.  Assumes that any other register can be used as a scratch.
   void CheckEnumCache(Register null_value, Label* call_runtime);
 
+  // AllocationSiteInfo support. Arrays may have an associated
+  // AllocationSiteInfo object that can be checked for in order to pretransition
+  // to another type.
+  // On entry, receiver_reg should point to the array object.
+  // scratch_reg gets clobbered.
+  // If allocation info is present, jump to allocation_info_present
+  void TestJSArrayForAllocationSiteInfo(Register receiver_reg,
+                                        Register scratch_reg,
+                                        Label* allocation_info_present);
+
  private:
   void CallCFunctionHelper(Register function,
                            int num_reg_arguments,