Reapply ARM root array change to reduce const pool size...

src/arm/cfg-arm.cc

 // Copyright 2009 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 49 matching lines @@
 
 void EntryNode::Compile(MacroAssembler* masm) {
   ASSERT(!is_marked());
   is_marked_ = true;
   {
     Comment cmnt(masm, "[ EntryNode");
     __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
     __ add(fp, sp, Operand(2 * kPointerSize));
     int count = CfgGlobals::current()->fun()->scope()->num_stack_slots();
     if (count > 0) {
-      __ mov(ip, Operand(Factory::undefined_value()));
+      __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
       for (int i = 0; i < count; i++) {
         __ push(ip);
       }
     }
     if (FLAG_trace) {
       __ CallRuntime(Runtime::kTraceEnter, 0);
     }
     if (FLAG_check_stack) {
       StackCheckStub stub;
       __ CallStub(&stub);
@@ skipping 211 matching lines @@
       __ str(ip, ToMemOperand(loc));
       break;
     case NOT_ALLOCATED:
       UNREACHABLE();
   }
 }
 
 #undef __
 
 } }  // namespace v8::internal