[PATCH] Don't build DFSan functionality for Android.

[Peter Collingbourne]

On Thu, Feb 13, 2014 at 01:14:02AM -0800, Stephen Hines wrote:
> Hi Peter,
> 
> We don't include DFSan as part of compiler-rt on Android, so these extern
> TLS declarations are not available (and thus result in link errors for LLVM
> 3.4). Let me know if this is ok, or if there is some other way you think we
> can resolve this.
> 
> Thanks,
> Steve

I'm surprised that the compiler emits a reference to the TLS symbols because
the function is normally unreferenced. But this looks like the right thing to
do on Android because __thread doesn't seem to be supported on that platform,
so LGTM.

Thanks,
-- 
Peter