Adding assertions to fast elements conversion.

src/arm/codegen-arm.cc

 // Copyright 2011 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 162 matching lines @@
                                             r0,
                                             r1,
                                             lr,
                                             s0);
     __ Strd(r0, r1, MemOperand(r7, 8, PostIndex));
   }
   __ b(&entry);
 
   // Hole found, store the-hole NaN.
   __ bind(&convert_hole);
+
+  if (FLAG_debug_code) {
+    Label is_really_the_hole;
+    __ CompareRoot(r9, Heap::kTheHoleValueRootIndex);
+    __ b(eq, &is_really_the_hole);
+    __ Abort("object found in smi-only array");
+    __ bind(&is_really_the_hole);
+  }
+
   __ Strd(r4, r5, MemOperand(r7, 8, PostIndex));
 
   __ bind(&entry);
   __ cmp(r7, r6);
   __ b(lt, &loop);
 
   if (!vfp3_supported) __ Pop(r1, r0);
   __ pop(lr);
 }
 
@@ skipping 103 matching lines @@
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
   __ pop(lr);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM