[PATCH] Correct a race condition between the e500 core decrementer wrapping and the tick interrupt being handled

[Nick Withers]

Hi all,

Please find attached a patch to close a race between the e500 PowerPC
decrementer wrapping and the associated tick interrupt handler doing its
thing.

The issue came up in the users@ list:
http://lists.rtems.org/pipermail/users/2014-November/028362.html

With these changes and not without, the spnsext01 test passes on the
MVME3100.
-- 
Nick Withers

Embedded Systems Programmer
Department of Nuclear Physics, Research School of Physics and Engineering
The Australian National University (CRICOS: 00120C)
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