[crankshaft][runtime] Initialize uninitialized double fields with hole NaN value instead of 0.0.

src/factory.h

 // 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/globals.h"
 #include "src/isolate.h"
 #include "src/messages.h"
@@ skipping 418 matching lines @@
         Smi::IsValid(static_cast<int32_t>(value))) {
       return Handle<Object>(Smi::FromInt(static_cast<int32_t>(value)),
                             isolate());
     }
     return NewNumber(static_cast<double>(value), pretenure);
   }
   Handle<HeapNumber> NewHeapNumber(double value,
                                    MutableMode mode = IMMUTABLE,
                                    PretenureFlag pretenure = NOT_TENURED);
 
+  Handle<HeapNumber> NewMutableHeapNumber(
+      PretenureFlag pretenure = NOT_TENURED) {
+    double hole_nan = bit_cast<double>(kHoleNanInt64);
+    return NewHeapNumber(hole_nan, MUTABLE, pretenure);
+  }
+
 #define SIMD128_NEW_DECL(TYPE, Type, type, lane_count, lane_type) \
   Handle<Type> New##Type(lane_type lanes[lane_count],             \
                          PretenureFlag pretenure = NOT_TENURED);
   SIMD128_TYPES(SIMD128_NEW_DECL)
 #undef SIMD128_NEW_DECL
 
   Handle<JSWeakMap> NewJSWeakMap();
 
   Handle<JSObject> NewArgumentsObject(Handle<JSFunction> callee, int length);
 
@@ skipping 362 matching lines @@
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
 
   void SetClassFunctionInstanceDescriptor(Handle<Map> map);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_