glsl: don't pass gl_context to lower shared references.

this uses the consts only

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14433>

src/compiler/glsl/linker.cpp

@@ -4581,7 +4581,7 @@ link_varyings_and_uniforms(unsigned first, unsigned last,
                              ctx->Const.UseSTD430AsDefaultPacking);
 
       if (i == MESA_SHADER_COMPUTE)
-         lower_shared_reference(ctx, prog, prog->_LinkedShaders[i]);
+         lower_shared_reference(&ctx->Const, prog, prog->_LinkedShaders[i]);
 
       lower_vector_derefs(prog->_LinkedShaders[i]);
       do_vec_index_to_swizzle(prog->_LinkedShaders[i]->ir);