r174943 - Fix a bug reduced from a crash when trying to use modules with libc++. We check

[Rafael Espíndola]

>  Linkage NamedDecl::getLinkage() const {
> -  if (HasCachedLinkage) {
> -    assert(Linkage(CachedLinkage) ==
> -           getLVForDecl(this, true).linkage());
> +  if (HasCachedLinkage)
>      return Linkage(CachedLinkage);
> -  }

This was one of my favorites asserts :-(

Would the attached patch be OK?


Cheers,
Rafael
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