Never hchange nan-hole to hole or hole to nan-hole.

src/mips/lithium-codegen-mips.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 4748 matching lines @@
   }
 
   Label no_special_nan_handling;
   Label done;
   if (convert_hole) {
     DoubleRegister input_reg = ToDoubleRegister(instr->value());
     __ BranchF(&no_special_nan_handling, NULL, eq, input_reg, input_reg);
     __ Move(reg, scratch0(), input_reg);
     Label canonicalize;
     __ Branch(&canonicalize, ne, scratch0(), Operand(kHoleNanUpper32));
-    __ li(reg, factory()->the_hole_value());
+    __ li(reg, factory()->undefined_value());
     __ Branch(&done);
     __ bind(&canonicalize);
     __ Move(input_reg,
             FixedDoubleArray::canonical_not_the_hole_nan_as_double());
   }
 
   __ bind(&no_special_nan_handling);
   DeferredNumberTagD* deferred = new(zone()) DeferredNumberTagD(this, instr);
   if (FLAG_inline_new) {
     __ LoadRoot(scratch, Heap::kHeapNumberMapRootIndex);
@@ skipping 1065 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal