Stabilize AArch64 support

Up until now GHC has been largely untested on AArch64 despite there being a non-trivial number of users relying on it. We should fix this.

There are a number of issues which need to be resolved to have defensible AArch64 support:

(#15449 (closed)) GHC's treatment of memory ordering was woefully inadequate
(#16776, #16784 (closed), ) A variety of linker issues
(#16782 (closed)) DYNAMIC_BY_DEFAULT, which would allow us to side-step above linker issues, is disabled
(#16087) The LLVM codegen seems to break the external interpreter; fixed by DYNAMIC_BY_DEFAULT?

Edited Aug 10, 2019 by Ben Gamari

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