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Adjust `CmmParse.y` to parse the `cmpxchg{8, 16, 32, 64}` instructions and use the 32 respectively the 64 bit variant in `Primops.cmm`. This effectively eliminates the compare-and-swap ccall to the rts. Based off the mailing list question from @osa1 (https://mail.haskell.org/pipermail/ghc-devs/2016-July/012506.html). Reviewers: simonmar, austin, erikd, bgamari, trommler Reviewed By: erikd, bgamari, trommler Subscribers: carter, trommler, osa1, thomie Differential Revision: https://phabricator.haskell.org/D2431
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