fix performance hit in argument unpacking when passing keyword arguments into...

fix performance hit in argument unpacking when passing keyword arguments into functions that have both required positional and optional keyword arguments

Cython/Compiler/Nodes.py

@@ -2647,10 +2647,10 @@ class DefNode(FuncDefNode):
                     if arg.kw_only:
                         # handled separately below
                         continue
-                    code.putln('if (kw_args > %d) {' % num_required_args)
+                    code.putln('if (kw_args > 0) {')
                     code.putln('PyObject* value = PyDict_GetItem(%s, %s);' % (
                         Naming.kwds_cname, pystring_cname))
-                    code.putln('if (unlikely(value)) { values[%d] = value; kw_args--; }' % i)
+                    code.putln('if (value) { values[%d] = value; kw_args--; }' % i)
                     code.putln('}')
                 else:
                     num_required_args -= 1