[Feature Request] Execution Test for DXIL Native Vectors

[pow2clk]

Execution tests for native vectors are needed to verify that interfaces are not only able to parse DXIL with vectors, but use them correctly.

Is your feature request related to a problem? Please describe.

See #7067 for compiler implementation. LLVM IR has supported native vectors for a long time, but they haven't been allowed in DXIL. This may mean that platforms can process the native vectors, but there may be many flaws in how they actually use them. Tests would need to ensure that vector operations and intrinsics produce correct results.

Describe the solution you'd like

Existing tests for DXIL intrinsics should be leveraged to test for native vector variants. To do this, we should just need to recompile them using a 6.9 target.