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Philip Reames 63be0dc80c [X86][GlobalISEL] Support lowering aligned unordered atomics
The existing lowering code is accidentally correct for unordered atomics as far as I can tell. An unordered atomic has no memory ordering, and simply requires the actual load or store to be done as a single well aligned instruction. As such, relax the restriction while adding tests to ensure the lowering remains correct in the future.

Differential Revision: https://reviews.llvm.org/D57803

llvm-svn: 356280
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