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Previously if we had both ld.lld and ld.gold installed but a gcc which didn't support -fuse-ld=lld we would fail when trying ld.lld and fall immediately back to plain ld. Now we will try ld.gold as well. This was brought to light by #14280, where using ld.bfd resulted in a broken stage2 compiler. Test Plan: Configure Reviewers: angerman, hvr, austin Reviewed By: angerman Subscribers: rwbarton, thomie, erikd GHC Trac Issues: #14280 Differential Revision: https://phabricator.haskell.org/D4038
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