Add monomorphic CompareNilICs and Crankshaft support

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index d232a88137a4d1f46df39f3256cd76fae62f8416..574c387647741199b40b9bfea25875c1a587a407 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -96,6 +96,19 @@ void TransitionElementsKindStub::InitializeInterfaceDescriptor(
 }
 
 
+void CompareNilICStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { r0 };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ =
+      FUNCTION_ADDR(CompareNilIC_Miss);
+  descriptor->miss_handler_ =
+      ExternalReference(IC_Utility(IC::kCompareNilIC_Miss), isolate);
+}
+
+
 static void InitializeArrayConstructorDescriptor(Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   // register state