[C++ patch] instantiate_decl cleanup

[Nathan Sidwell]

I've committed this patch, which is the tidying up I've done for the 
67273 and 79253 patch on its way.

instantiate_decl's cleanup is a little untidy because of some 'goto out' 
statements, that jump into the middle of the cleanup.

1) finally make defer_ok a bool
2) sort the state restoration to be in reverse order.
3) move the omp_privatization restoration to just before the out label. 
(it's saved after the last goto).

nathan
-- 
Nathan Sidwell
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