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target/xtensa: fix access to the INTERRUPT SR
INTERRUPT special register may be changed both by the core (by writing to INTSET and INTCLEAR registers) and by external events (by triggering and clearing HW IRQs). In MTTCG this state must be protected from concurrent access, otherwise interrupts may be lost or spurious interrupts may be detected. Use atomic operations to change INTSET SR. Fix wsr.intset so that it soesn't clear any bits. Fix wsr.intclear so that it doesn't clear bit that corresponds to NMI. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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