Function naga::back::pipeline_constants::process_override

fn process_override(
    (old_h, override_, span): (Handle<Override>, Override, Span),
    pipeline_constants: &PipelineConstants,
    module: &mut Module,
    override_map: &mut HandleVec<Override, Handle<Constant>>,
    adjusted_global_expressions: &HandleVec<Expression, Handle<Expression>>,
    adjusted_constant_initializers: &mut HashSet<Handle<Constant>>,
    global_expression_kind_tracker: &mut ExpressionKindTracker,
) -> Result<Handle<Constant>, PipelineConstantError>

Add a Constant to module for the override old_h.

Add the new Constant to override_map and adjusted_constant_initializers.