ac/llvm: set target features per function instead of per target machine

This is a cleanup that allows the removal of the wave32 target machine and
the wave32 pass manager.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10813>

src/amd/vulkan/radv_nir_to_llvm.c

@@ -107,6 +107,7 @@ create_llvm_function(struct ac_llvm_context *ctx, LLVMModuleRef module, LLVMBuil
    }
 
    ac_llvm_set_workgroup_size(main_function, max_workgroup_size);
+   ac_llvm_set_target_features(main_function, ctx);
 
    return main_function;
 }