vkd3d-shader/hlsl: Don't optimize semantic register allocations in SM1.
Fixes an issue in the game "A Raven Monologue", where the game boots into a black screen.
This matches the behaviour of the native d3d compiler.
Fixes an issue in the game "A Raven Monologue", where the game boots into a black screen.
This matches the behaviour of the native d3d compiler.