rustc: Add the `cmpxchg16b` target feature on x86/x86_64#56826

Merged

bors merged 1 commit intorust-lang:masterfrom alexcrichton:atomic-u128

Dec 16, 2018

+2

Commits on Dec 14, 2018

rustc: Add the cmpxchg16b target feature on x86/x86_64
alexcrichton
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