ARM nested interrupt handling was broken

[sebastian.huber at embedded-brains.de (Sebastian Huber)]

Hi,

the implementation of the ARM nested interrupt handling was broken
(cpukit/score/cpu/arm/arm_exc_interrupt.S).  The broken implementation used the
INT mode to process interrupts, but with this approach it is impossible to
preserve the link register during interrupt nesting.  Every ARM user who uses
nested interrupts should update.  Please review and comment the new implementation.

CU

-- 
Sebastian Huber, embedded brains GmbH

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