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- Add shader model 6.0, 6.1, and 6.2 targets
- Add DXIL and DXIL assembly as output formats
- Add header for DXC API to `external/`
- Add `dxc-support.cpp` that wraps usage of the API
- Add `-pass-through dxc` option, equivalent to what we have for `fxc`
Notes:
* This does *not* include any logic to add `dxcompiler.dll` to our build process; that is way out of scope for the build complexity I'm ready to deal with
* For right now, the use of `dxcompiler.dll` is hard-coded, and it must be discoverable in the current executable's search path; options to customize can come later
* The `-pass-through` option is kind of silly because the code doesn't actually pay attention to the value (just whether it is set). If you set it to `fxc` but ask for DXIL, we pass through `dxc` anyway.
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