[PING] New SystemZ backend: LLVM code changes

[Richard Sandiford]

A ping for the SystemZ port.  Eric has reviewed the configure and test bits,
so I think those are approved.  Anton has reviewed the lib/Target bits,
and Uli has addressed his comments, but Anton thought that someone else
should have a look too.  Thanks to everyone who has commented so far!

Here's a repost of the bits that I think still need review.  I realise
this might not be the best time, what with the conference this week,
but maybe someone would like something to read on their trip back?

Thanks,
Richard

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