Add basic support for Shader Model 6.3 profiles (#594)

* Add basic support for Shader Model 6.3 profiles

This adds `vs_6_3` and friends as available profiles, but doesn't add any new builtins specific to Shader Model 6.3.

In order to better support the ray tracing shader stages, Slang will not automatically map any attempt to compile a DXR shader up to SM 6.3 (the shader model officially required for these stages) and to the `lib_*` profiles (because there are no stage-specific profiles for these cases).

As an added detail, when invoking `dxcompiler.dll` to generate DXIL for DXR shaders, specify an empty entry-point name, since that is expected for `lib_*` profiles.

* Fixup: don't drop [shader(...)] attributes

The previous change makes the "effective profile" for DXR compiles no longer include a stage, but we had been using the stage stored on the effective profile in exactly one place: when determining what to output for a `[shader("...")]` attribute.

This fixup makes it so that we use the stage from the profile on the entry-point layout instead, which seems like the right choice anyway, if we are ever going to emit multiple entry points at once.

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