[riot-notifications] [RIOT-OS/RIOT] cpu/arm7_common: Fix thread_yield_higher in ISR (#11887)

benpicco notifications at github.com
Wed Sep 11 00:08:14 CEST 2019

benpicco approved this pull request.

I don't have hardware to test, but the change is easy to follow nonetheless.
`sched_context_switch_request` is evaluated by [`arm_irq_handler`](https://github.com/RIOT-OS/RIOT/blob/master/cpu/arm7_common/common.s#L112) right after the ISR (which is the only piece of code that could call `thread_yield_higher()` in interrupt context) has been executed.

When not in interrupt context, a Supervisor Call is executed as before.

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