Hi,

This patch adds one part of libphobos support for hppa-linux-gnu, as
posted by John.  Apologies for it taking a while to get round to
downstreaming this.

Preliminary testsuite runs have been done which show some promising
results, but still a little more to do, particularly with handling the
stack growth direction.

Bootstrapped and regression tested on x86_64-linux-gnu, which only
verifies that all scoping is correct.

Committed to trunk as r268055.

-- 
Iain
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