[llvm] [DXIL] Add DXIL SubArch to correspond to version number (PR #89125)

[Damyan Pepper via llvm-commits]

damyanp wrote:

> In the clang DXC driver mode we translate target profiles to triples (i.e. `ps_6_6` to `dxil-pc-shadermodel6.6-pixel`). Clang needs two changes to utilize this [...]

This explanation helps.  I don't recall seeing this written down anywhere before so I've been trying to understand this change without this context, which is why I was asking for more explanation about what's going on.


https://github.com/llvm/llvm-project/pull/89125