4.6 Barrier Patch for Review

[Joel Sherrill]

Hi,

Attached is my version of the barrier patch for 4.6.
It attempt to:

 + add RTEMS_COMPILER_MEMORY_BARRIER to system.h
 + uses the barrier in ISR disable/enable
 + uses the barrier in Thread Dispatching disable/enable

It compiles but needs review.

Please review and give feedback so I can commit it. :)

--joel
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