[PATCH] Clang support for 'optnone' attribute

[Robinson, Paul]

Support the 'optnone' attribute in Clang (including documentation!).

If this possibly looks familiar, I had actually submitted and gotten
approval for an equivalent patch quite some time ago, but then it
took a rather long time to get the LLVM support in, and I didn't want
to commit the Clang part until LLVM was willing to fulfill the contract.
In the meantime the attribute support in Clang has had shall we say a
few changes, so I figured a fresh patch was the best approach.

Thanks,
--paulr

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