test/logicop: expand tests to also cover MSAA render target

Iago Toral requested to merge itoral/piglit:logicop_msaa into master

Drivers that lower logic ops might need to emit different code when the render target is multisampled. This is the case for v3d for example. This patch makes it so that we run the tests for both single-sampled and multi-sampled targets when the implementation supports ARB_texture_storage_multisample.

Tested with i965 and v3d.

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