Ben Gamari authored Jun 29, 2017 and Ben Gamari committed Jun 29, 2017

This bug affects bfd ld on ARMv7, causing ld to incorrectly emit
R_REL_COPY relocations, breaking tables-next-to-code. We've known about
it for several years now and there is not yet a fix upstream. Previously
we would simply force use of ld.gold on ARM. However, given the rework
of linking configuration, I thought a more principled solution was in
order.

Test Plan: Validate on armv7

Reviewers: austin, hvr

Subscribers: angerman, rwbarton, thomie, erikd

GHC Trac Issues: #4210

Differential Revision: https://phabricator.haskell.org/D3676