[Openmp-dev] Proposal: Resolve combined directives in parsing phase

[C Bergström via Openmp-dev]

James is really clear on the point of "AS-IF" - The compiler can do
anything as long as the user can't observe a difference in the behavior.
The standard can say add a barrier, but if the compiler can make the code
visibly act the same with our without a barrier that's all that matters.
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