[mips] Fix using signaling NaN for holes in fixed double arrays.

src/mips/macro-assembler-mips.h

 // 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.
 
 #ifndef V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
 #define V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
 
 #include "src/assembler.h"
 #include "src/globals.h"
 #include "src/mips/assembler-mips.h"
@@ skipping 1219 matching lines @@
                 Label* fail,
                 SmiCheckType smi_check_type);
 
   // Check if the map of an object is equal to a specified weak map and branch
   // to a specified target if equal. Skip the smi check if not required
   // (object is known to be a heap object)
   void DispatchWeakMap(Register obj, Register scratch1, Register scratch2,
                        Handle<WeakCell> cell, Handle<Code> success,
                        SmiCheckType smi_check_type);
 
+  // If the value is a NaN, canonicalize the value else, do nothing.
+  void FPUCanonicalizeNaN(const DoubleRegister dst, const DoubleRegister src);
+
   // Get value of the weak cell.
   void GetWeakValue(Register value, Handle<WeakCell> cell);
 
   // Load the value of the weak cell in the value register. Branch to the
   // given miss label is the weak cell was cleared.
   void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss);
 
   // Load and check the instance type of an object for being a string.
   // Loads the type into the second argument register.
   // Returns a condition that will be enabled if the object was a string.
@@ skipping 643 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_