ARM64: Use default-NaN mode to canonicalize NaNs.

src/arm64/lithium-arm64.h

 // Copyright 2013 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_ARM64_LITHIUM_ARM64_H_
 #define V8_ARM64_LITHIUM_ARM64_H_
 
 #include "hydrogen.h"
 #include "lithium-allocator.h"
 #include "lithium.h"
@@ skipping 2343 matching lines @@
     return is_external() || is_fixed_typed_array();
   }
   LOperand* elements() { return this->inputs_[0]; }
   LOperand* key() { return this->inputs_[1]; }
   LOperand* value() { return this->inputs_[2]; }
   ElementsKind elements_kind() const {
     return this->hydrogen()->elements_kind();
   }
 
   bool NeedsCanonicalization() {
+    if (hydrogen()->value()->IsAdd() || hydrogen()->value()->IsSub() ||
+        hydrogen()->value()->IsMul() || hydrogen()->value()->IsDiv()) {
+      return false;
+    }
     return this->hydrogen()->NeedsCanonicalization();
   }
   uint32_t additional_index() const { return this->hydrogen()->index_offset(); }
 
   void PrintDataTo(StringStream* stream) V8_OVERRIDE {
     this->elements()->PrintTo(stream);
     stream->Add("[");
     this->key()->PrintTo(stream);
     if (this->hydrogen()->IsDehoisted()) {
       stream->Add(" + %d] <-", this->additional_index());
@@ skipping 694 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_ARM64_H_