[HLSL] Flesh out basic type typedefs (#104479)

We had a few missing typedefs that are supported by DXC. Specifically
1-element vectors, size-explicit 32-bit types and size-explicit floating
point types.

This adds the typedefs and a test file that just verifies the expected
sizes and vector element counts.

I needed to add some of these missing typedefs to address #102964, and
thought instead I should try and be a bit comprehensive and put it in a
separate PR.

Nothing complicated here, just typedefs and static asserts to verify
them.

0 files changed, 0 insertions, 0 deletions