Bug#919628: Apply Julia's LLVM patches

[M. Zhou]

On Sun, Feb 03, 2019 at 10:30:26AM +0100, Sylvestre Ledru wrote:
> > > I'm glad to assemble a detailed list of patches and their
> > > corresponding bugs
> > > if you ask. And note that I'm traveling tomorrow (Jan 20) so please
> > > don't
> > > expect response from me on that day.
> > 
> > if you could do that, this would be great! thanks.
> > 
> Ping!

TBH it's hard for me to understand patches for LLVM and such
difficulty resulted in me dragging this TODO item... Some of
Julia's patches differ from upstream differential, and some
of them needs to be rebased on Debian's source...

Anyway I think I'll try it again... but I cannot promise
to provide a clean patch set that doesn't need rebase.