[turbofan] Add AllocateHeapNumberStub to avoid runtime call.

src/ia32/interface-descriptors-ia32.cc

Index: src/ia32/interface-descriptors-ia32.cc
diff --git a/src/ia32/interface-descriptors-ia32.cc b/src/ia32/interface-descriptors-ia32.cc
index e5096b33ce9c8fae0ece6b373bb2caddb04535c4..6c77ef8f81498e74bc481c9575f113e0777d2d72 100644
--- a/src/ia32/interface-descriptors-ia32.cc
+++ b/src/ia32/interface-descriptors-ia32.cc
@@ -155,6 +155,15 @@ void TransitionElementsKindDescriptor::Initialize(
 }
 
 
+void AllocateHeapNumberDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // register state
+  // esi -- context
+  Register registers[] = {esi};
+  data->Initialize(arraysize(registers), registers, nullptr);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   // register state