CoopVec Add tests with invalid DXIL

[simoll]

Current tests only check that valid dxil with the new CoopVec opcodes passes the validator.
Add tests with invalid coopvec dxil that check for expected validation errors.

[anupamachandra]

Add checks and tests for invalid input vector and resource handles.

[damyanp]

@anupamachandra / @simoll - is this all done now? Can we close it?

[damyanp]

See https://devblogs.microsoft.com/directx/shader-model-6-9-and-the-future-of-cooperative-vector/