Philip Reames db036ee0a4 [X86/Atomics] Correct a few transforms for new atomic lowering ...

This is a partial fix for the issues described in commit message of 027aa27 (the revert of G24609).  Unfortunately, I can't provide test coverage for it on it's own as the only (known) wrong example is still wrong, but due to a separate issue.

These fixes are cases where when performing unrelated DAG combines, we were dropping the atomicity flags entirely.

2019-11-05 13:20:08 -08:00

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