minor improvements in __Pyx_ArgTypeTest() and prevent it from raising C...

minor improvements in __Pyx_ArgTypeTest() and prevent it from raising C compiler warnings by inlining it

Cython/Utility/FunctionArguments.c

 //////////////////// ArgTypeTest.proto ////////////////////
 
-static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+static CYTHON_INLINE int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
     const char *name, int exact); /*proto*/
 
 //////////////////// ArgTypeTest ////////////////////
 
-static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+static void __Pyx_RaiseArgumentTypeInvalid(const char* name, PyObject *obj, PyTypeObject *type) {
+    PyErr_Format(PyExc_TypeError,
+        "Argument '%.200s' has incorrect type (expected %.200s, got %.200s)",
+        name, type->tp_name, Py_TYPE(obj)->tp_name);
+}
+
+static CYTHON_INLINE int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
     const char *name, int exact)
 {
-    if (!type) {
+    if (unlikely(!type)) {
         PyErr_Format(PyExc_SystemError, "Missing type object");
         return 0;
     }
@@ -16,15 +22,13 @@ static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed
     else if (exact) {
         if (likely(Py_TYPE(obj) == type)) return 1;
         #if PY_MAJOR_VERSION == 2
-        else if ((type == &PyBaseString_Type) && __Pyx_PyBaseString_CheckExact(obj)) return 1;
+        else if ((type == &PyBaseString_Type) && likely(__Pyx_PyBaseString_CheckExact(obj))) return 1;
         #endif
     }
     else {
-        if (PyObject_TypeCheck(obj, type)) return 1;
+        if (likely(PyObject_TypeCheck(obj, type))) return 1;
     }
-    PyErr_Format(PyExc_TypeError,
-        "Argument '%s' has incorrect type (expected %s, got %s)",
-        name, type->tp_name, Py_TYPE(obj)->tp_name);
+    __Pyx_RaiseArgumentTypeInvalid(name, obj, type);
     return 0;
 }