Stop using plain Arrays internally in built-in functions.

src/arm/builtins-arm.cc

Index: src/arm/builtins-arm.cc
diff --git a/src/arm/builtins-arm.cc b/src/arm/builtins-arm.cc
index 6e8fe28a2bbc4ab21ada33e73d5cacd1bbfdfece..169bc6bf8535a285a78e66d0a13f7541c28e6c22 100644
--- a/src/arm/builtins-arm.cc
+++ b/src/arm/builtins-arm.cc
@@ -428,7 +428,7 @@ void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
   GenerateLoadArrayFunction(masm, r1);
 
   if (FLAG_debug_code) {
-    // Initial map for the builtin Array function shoud be a map.
+    // Initial map for the builtin Array functions should be maps.
     __ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
     __ tst(r2, Operand(kSmiTagMask));
     __ Assert(ne, "Unexpected initial map for Array function");