Olivier Houchard ed8bce2cd5 In do_ast, make sure the interrupts are enabled before calling ast().
We can reach that point with IRQs disabled, and calling ast() with IRQs 
disabled can lead to a deadlock.
This should fix the freezes on arm64 under load.

Reviewed by:	andrew
2018-02-26 13:12:51 +00:00
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