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[ImplicitNullChecks] Support unordered atomic accesses

Authored by reames on Mar 12 2019, 8:25 PM.

Description

[ImplicitNullChecks] Support unordered atomic accesses

Update the INC pass to allow folding unordered atomics. This is the first optimization unblocked by the changes landed from D57601.

llvm-svn: 356006

Details