[turbofan] Prevent storing signalling NaNs into holey double arrays.

src/compiler/mips64/code-generator-mips64.cc

 // Copyright 2014 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/ast/scopes.h"
 #include "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 1256 matching lines @@
                  i.InputDoubleRegister(1));
         __ sel_d(i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
       } else {
         __ c_d(OLT, i.InputDoubleRegister(1), i.InputDoubleRegister(0));
         // Right operand is result, passthrough if false.
         __ movt_d(i.OutputDoubleRegister(), i.InputDoubleRegister(1));
       }
       break;
     }
+    case kMips64Float64SilenceNaN:
+      __ FPUCanonicalizeNaN(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kMips64Float32Max: {
       // (b < a) ? a : b
       if (kArchVariant == kMips64r6) {
         __ cmp_s(OLT, i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
         __ sel_s(i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
       } else {
         __ c_s(OLT, i.InputDoubleRegister(0), i.InputDoubleRegister(1));
         // Left operand is result, passthrough if false.
@@ skipping 985 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8