[cfe-commits] [patch][pr11822] Error on mismatched #pragma GCC visibility push/pop

[Rafael Espíndola]

The attached patch fixes PR11822. With it we now reject cases that gcc
rejects or accepts with very strange semantics (a push being matched
by a namespace end).

Richard, these are the cases that we were accepting and you think we
should reject, right?

Chandler, some word smithing on the errors would be appreciated.

Thanks,
Rafael
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