[riot-notifications] [RIOT-OS/RIOT] cpu/arm7_common: Make irq_*() compiler barriers (#11440)

Marian Buschsieweke notifications at github.com
Fri May 24 07:35:28 CEST 2019

@gschorcht: Perfect, so only the `memory` clobbers are needed there to make sure the compiler does not move memory accesses wrappen in `irq_disable()` / `irq_restore()` outside of it with LTO enabled.

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