Okay, weird.  So the DICompileUnit wouldn't even get written out to
bitcode, IIUC.  LGTM then.

> On 2016-Apr-06, at 14:31, Adrian Prantl <apra...@apple.com> wrote:
> 
> aprantl added a comment.
> 
> Duncan: There already exists a verifier check that ensures each DICompileUnit 
> is listed in llvm.dbg.cu.
> This didn't break existing users of sample-based profiling, because the 
> Verifier cannot *find* the orphaned DICompileUnits. After the DISubprogram / 
> DICompileUnit pointer reversal, however, this will be possible and the 
> verification will fail.
> 
> 
> http://reviews.llvm.org/D18808
> 
> 
> 

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