[turbofan] Add AllocateHeapNumberStub to avoid runtime call.

src/arm64/interface-descriptors-arm64.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/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/interface-descriptors.h"
 
@@ skipping 167 matching lines @@
 void TransitionElementsKindDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   // cp: context
   // x0: value (js_array)
   // x1: to_map
   Register registers[] = {cp, x0, x1};
   data->Initialize(arraysize(registers), registers, NULL);
 }
 
 
+void AllocateHeapNumberDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // cp: context
+  Register registers[] = {cp};
+  data->Initialize(arraysize(registers), registers, nullptr);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   // cp: context
   // x1: function
   // x2: allocation site with elements kind
   // x0: number of arguments to the constructor function
   Register registers[] = {cp, x1, x2};
   data->Initialize(arraysize(registers), registers, NULL);
 }
 
@@ skipping 164 matching lines @@
       Representation::Tagged(),    // holder
       Representation::External(),  // api_function_address
   };
   data->Initialize(arraysize(registers), registers, representations,
                    &default_descriptor);
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64