[arm] Turn off the default NaN mode on arm.

src/crankshaft/arm/lithium-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/arm/lithium-codegen-arm.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/arm/lithium-gap-resolver-arm.h"
@@ skipping 4012 matching lines @@
   } else {
     int shift_size = (instr->hydrogen()->key()->representation().IsSmi())
         ? (element_size_shift - kSmiTagSize) : element_size_shift;
     __ add(scratch, elements, Operand(base_offset));
     __ add(scratch, scratch,
            Operand(ToRegister(instr->key()), LSL, shift_size));
   }
 
   if (instr->NeedsCanonicalization()) {
     // Force a canonical NaN.
-    if (masm()->emit_debug_code()) {
-      __ vmrs(ip);
-      __ tst(ip, Operand(kVFPDefaultNaNModeControlBit));
-      __ Assert(ne, kDefaultNaNModeNotSet);
-    }
     __ VFPCanonicalizeNaN(double_scratch, value);
     __ vstr(double_scratch, scratch, 0);
   } else {
     __ vstr(value, scratch, 0);
   }
 }
 
 
 void LCodeGen::DoStoreKeyedFixedArray(LStoreKeyed* instr) {
   Register value = ToRegister(instr->value());
@@ skipping 1498 matching lines @@
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8