Ben Gamari authored Sep 25, 2015 and Ben Gamari committed Sep 25, 2015

This is supposed to be encoded with ULEB128 which the previous
implementation would only guarranty with short lengths. This likely
holds in nearly all cases, but I'd really rather not take changes.

I fix this using the `.uleb128` directive. I'm not certain that this is
portable across assemblers but it makes this quite straightforward and
at the moment I value correctness over portability.

Test Plan: Compare implementation to DWARF spec

Reviewers: scpmw, austin

Reviewed By: austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1220