[turbofan] Add AllocateHeapNumberStub to avoid runtime call.

src/arm64/interface-descriptors-arm64.cc

Index: src/arm64/interface-descriptors-arm64.cc
diff --git a/src/arm64/interface-descriptors-arm64.cc b/src/arm64/interface-descriptors-arm64.cc
index 705e61bd7a4fa7f902fea4ed56adb2d7e8208fe6..57eebcc3b5c078d28b55f33065ae72c5e99ac7eb 100644
--- a/src/arm64/interface-descriptors-arm64.cc
+++ b/src/arm64/interface-descriptors-arm64.cc
@@ -185,6 +185,14 @@ void TransitionElementsKindDescriptor::Initialize(
 }
 
 
+void AllocateHeapNumberDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // cp: context
+  Register registers[] = {cp};
+  data->Initialize(arraysize(registers), registers, nullptr);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   // cp: context