[riot-notifications] [RIOT-OS/RIOT] kinetis: Optimize GPIO interrupt handler (#8558)

Joakim Nohlgård notifications at github.com
Tue Nov 6 14:45:07 CET 2018

Rewrote this using the GCC builtin ctz function. Added some real measurements for the frdm-kw41z board.
The current improvement is from 22 µs to 6.1 µs.

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