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[AMDGPU] pin lit test divergent-unswitch.ll to the old pass manager
The loop-unswitch transform should not be performed on a loop whose condition is divergent. For this to happen correctly, divergence analysis must be available. The existing divergence analysis has not been ported to the new pass manager yet. As a result, loop unswitching on the new pass manager is currently unsafe on targets that care about divergence. This test is temporarily disabled to unblock work on the new pass manager. The issue is now tracked in bug 48819. Reviewed By: foad Differential Revision: https://reviews.llvm.org/D95051
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