If I add an assert to check (F != Flags) in setFlags, 2700+ out of 5000+ clang 
regression tests fail. I haven’t figured out which parts of clang are passing 
the same value to setFlags.

> On Apr 28, 2016, at 7:38 PM, Richard Smith via cfe-commits 
> <cfe-commits@lists.llvm.org> wrote:
> 
> On Thu, Apr 28, 2016 at 7:34 PM, Akira Hatanaka via cfe-commits 
> <cfe-commits@lists.llvm.org <mailto:cfe-commits@lists.llvm.org>> wrote:
> ahatanak added a comment.
> 
> Thanks for the review. I committed the patch in r267956 and r267975.
> 
> Do you think I should make setFlags(unsigned F) return early if F == Flags?
> 
> I don't think that should happen in practice, so it doesn't seem worth 
> checking.
> 
> Repository:
>   rL LLVM
> 
> http://reviews.llvm.org/D19175 <http://reviews.llvm.org/D19175>
> 
> 
> 
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