Bug#919628: Apply Julia's LLVM patches

[Mo Zhou]

Hi,

On Wed, Mar 06, 2019 at 04:27:16PM +0100, Sylvestre Ledru wrote:
> I am off this week. If you could do a merge request to address the issues,
> that would be amazing :)

> >    36 #fix-lldb-server-build
> >    38 #bug-30342.diff
> >   67 # D51639-optim-issue.diff
> >   54 #install-lldb-sb-headers.patch

I've dealt with those 4 and pushed changes to the 6.0 branch.

> >    40 #clang-fix-cmpxchg8-detection-on-i386.patch

I cannot find any clue on how to rebase this patch due to significant
context change, even if I compared it with the code of llvm-7.