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[compiler-rt][builtins] Add tests for atomic builtins support functions

Authored by luismarques on Oct 20 2020, 4:07 AM.

Description

[compiler-rt][builtins] Add tests for atomic builtins support functions

Adds some simple sanity checks that the support functions for the atomic
builtins do the right thing. This doesn't test concurrency and memory model
issues.

Differential Revision: https://reviews.llvm.org/D86278