A debug code assert needed to be behind the new optimize_constructed_arrays flag.

src/arm/builtins-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 539 matching lines @@
   if (FLAG_debug_code) {
     // The array construct code is only set for the builtin and internal
     // Array functions which always have a map.
     // Initial map for the builtin Array function should be a map.
     __ ldr(r3, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
     __ tst(r3, Operand(kSmiTagMask));
     __ Assert(ne, "Unexpected initial map for Array function");
     __ CompareObjectType(r1, r3, r4, MAP_TYPE);
     __ Assert(eq, "Unexpected initial map for Array function");
 
-    // We should either have undefined in r2 or a valid jsglobalpropertycell
-    Label okay_here;
-    Handle<Object> undefined_sentinel(
-        masm->isolate()->heap()->undefined_value(), masm->isolate());
-    Handle<Map> global_property_cell_map(
-        masm->isolate()->heap()->global_property_cell_map());
-    __ cmp(r2, Operand(undefined_sentinel));
-    __ b(eq, &okay_here);
-    __ ldr(r3, FieldMemOperand(r2, 0));
-    __ cmp(r3, Operand(global_property_cell_map));
-    __ Assert(eq, "Expected property cell in register ebx");
-    __ bind(&okay_here);
+    if (FLAG_optimize_constructed_arrays) {
+      // We should either have undefined in r2 or a valid jsglobalpropertycell
+      Label okay_here;
+      Handle<Object> undefined_sentinel(
+          masm->isolate()->heap()->undefined_value(), masm->isolate());
+      Handle<Map> global_property_cell_map(
+          masm->isolate()->heap()->global_property_cell_map());
+      __ cmp(r2, Operand(undefined_sentinel));
+      __ b(eq, &okay_here);
+      __ ldr(r3, FieldMemOperand(r2, 0));
+      __ cmp(r3, Operand(global_property_cell_map));
+      __ Assert(eq, "Expected property cell in register ebx");
+      __ bind(&okay_here);
+    }
   }
 
   if (FLAG_optimize_constructed_arrays) {
     Label not_zero_case, not_one_case;
     __ tst(r0, r0);
     __ b(ne, &not_zero_case);
     ArrayNoArgumentConstructorStub no_argument_stub;
     __ TailCallStub(&no_argument_stub);
 
     __ bind(&not_zero_case);
@@ skipping 1308 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(r3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM