MIPS: [turbofan] Add AllocateHeapNumberStub to avoid runtime call.

src/mips/interface-descriptors-mips.cc

Index: src/mips/interface-descriptors-mips.cc
diff --git a/src/mips/interface-descriptors-mips.cc b/src/mips/interface-descriptors-mips.cc
index 7e1496744bb1917f1f26eec4465bedaa1a0c2aa6..ecdaecf2b71216fe98be0c66f8baeaa4aa16367e 100644
--- a/src/mips/interface-descriptors-mips.cc
+++ b/src/mips/interface-descriptors-mips.cc
@@ -152,6 +152,15 @@ void TransitionElementsKindDescriptor::Initialize(
 }
 
 
+void AllocateHeapNumberDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // register state
+  // cp -- context
+  Register registers[] = {cp};
+  data->Initialize(arraysize(registers), registers, nullptr);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   // register state