Add test for tgl fast clear tracking bug

Open D Scott Phillips requested to merge scott-ph/crucible:wip/2020-04/tgl-fast-clear into main

On TGL, the hardware will "upgrade" writes to a CCS_E of the clear color to a fast clear. This test exercises a case where the driver isn't expecting the surface to be in the fast-cleared state, and so changes the clear color without doing a partial resolve.

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