Replace __Pyx_ArgTypeTest() inline function with a fast-path macro and a non-inline function.

Cython/Utility/FunctionArguments.c

 //////////////////// ArgTypeTest.proto ////////////////////
 
-static CYTHON_INLINE int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
-    const char *name, int exact); /*proto*/
 
-//////////////////// ArgTypeTest ////////////////////
+#define __Pyx_ArgTypeTest(obj, type, none_allowed, name, exact) \
+    ((likely((Py_TYPE(obj) == type) | (none_allowed && (obj == Py_None)))) ? 1 : \
+        __Pyx__ArgTypeTest(obj, type, name, exact))
 
-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 int __Pyx__ArgTypeTest(PyObject *obj, PyTypeObject *type, const char *name, int exact); /*proto*/
 
-static CYTHON_INLINE int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
-    const char *name, int exact)
+//////////////////// ArgTypeTest ////////////////////
+
+static int __Pyx__ArgTypeTest(PyObject *obj, PyTypeObject *type, const char *name, int exact)
 {
     if (unlikely(!type)) {
         PyErr_SetString(PyExc_SystemError, "Missing type object");
         return 0;
     }
-    if (none_allowed && obj == Py_None) return 1;
     else if (exact) {
-        if (likely(Py_TYPE(obj) == type)) return 1;
         #if PY_MAJOR_VERSION == 2
-        else if ((type == &PyBaseString_Type) && likely(__Pyx_PyBaseString_CheckExact(obj))) return 1;
+        if ((type == &PyBaseString_Type) && likely(__Pyx_PyBaseString_CheckExact(obj))) return 1;
         #endif
     }
     else {
         if (likely(__Pyx_TypeCheck(obj, type))) return 1;
     }
-    __Pyx_RaiseArgumentTypeInvalid(name, obj, type);
+    PyErr_Format(PyExc_TypeError,
+        "Argument '%.200s' has incorrect type (expected %.200s, got %.200s)",
+        name, type->tp_name, Py_TYPE(obj)->tp_name);
     return 0;
 }