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(parent: c01c25f) | patch

Use a non-locking test in TAS_SPIN() on all IA64 platforms.

Use a non-locking test in TAS_SPIN() on all IA64 platforms.

Per my testing, this works just as well with gcc as it does with HP's
compiler; and there is no reason to think that the effect doesn't occur
with icc, either.

Also, rewrite the header comment about enforcing sequencing around spinlock
operations, per Robert's gripe that it was misleading.

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