ghc-prim : Hide 64 bit primops when the word size is 32 bits (fixes #9886).
Summary: These primops were failing to compile on PowerPC (32 bit). There is also currently no way to call into these primops from Haskell code. Currently, the *only* way to call any of these C hs_atomic_* functions is via the fetch*IntArray primops which are only defined for Int values and Int is always the native word size. When these functions can be called (and tested) from Haskell code, then it will be worth while implementing them. Test Plan: Compile and run on x86, x86_64, powerpc and arm: testsuite/tests/concurrent/should_run/AtomicPrimops.hs Reviewers: tibbe, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D702 GHC Trac Issues: #9886
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