setBreakResultInfo

    fn setBreakResultInfo(gz: *GenZir, parent_ri: AstGen.ResultInfo) void {
        // Depending on whether the result location is a pointer or value, different
        // ZIR needs to be generated. In the former case we rely on storing to the
        // pointer to communicate the result, and use breakvoid; in the latter case
        // the block break instructions will have the result values.
        switch (parent_ri.rl) {
            .coerced_ty => |ty_inst| {
                // Type coercion needs to happen before breaks.
                gz.break_result_info = .{ .rl = .{ .ty = ty_inst }, .ctx = parent_ri.ctx };
            },
            .discard => {
                // We don't forward the result context here. This prevents
                // "unnecessary discard" errors from being caused by expressions
                // far from the actual discard, such as a `break` from a
                // discarded block.
                gz.break_result_info = .{ .rl = .discard };
            },
            else => {
                gz.break_result_info = parent_ri;
            },
        }
    }