support non-overridable 'inline' methods

[scoder]

When a method is declared 'inline', Cython should emit calling code that bypasses the method vtable. Code like the following would thus use a direct call to the small_method C function:

cdef class MyType:
     cdef list large_list
     cdef size_t y

     cdef big_method(self):
         for x in self.large_list:
             self.small_method(x)

     cdef inline small_method(self, x):
         self.y += x

This implies that 'inline' methods/functions are non-overridable.

[scoder]

A corresponding mailing list thread is here:

 http://comments.gmane.org/gmane.comp.python.cython.devel/8741

[scoder]

This is related to the "final" declaration on classes and methods, which is described in ticket #585 and #586.

[vitja]

fixed here  https://github.com/cython/cython/commit/38e9cde5a82c9073263795eb697e7149fe92a07b