[commit: ghc] wip/fix-docs's head updated: Revert "rts: Ensure that the_gc_thread is aligned" (6d68553)

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Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/fix-docs' now includes:

     d092321 Bump binary submodule to 0.8.6.0
     6826815 Bump Cabal submodule
     8712d32 circleci: Fix documentation building
     690bfd7 Try fixing OS X build
     108abf9 circleci: Reduce build verbosity
     87ceabb circleci: Reduce compression effort to 3
     9228a13 Allow arbitrary options to be passed to tar compression
     6d68553 Revert "rts: Ensure that the_gc_thread is aligned"