Thanks for the heads up, you can report the issue here. Meanwhile, you may find that rolling back to an older Catalyst driver resolves the issue.
A second report sent.
I gave up on this one.
I found an old post dating 2013.
Weird (and major) flickering using AMD 7970 :: The Bureau: XCOM Declassified General Discussions
If it was not fixed by that time it will never be.
Ruining the game on D3D9 solves the problem.
so you can max it out at last.
Retrieving data ...