simpleStrTok

fn simpleStrTok(
    gz: *GenZir,
    ri: ResultInfo,
    ident_token: Ast.TokenIndex,
    node: Ast.Node.Index,
    op_inst_tag: Zir.Inst.Tag,
) InnerError!Zir.Inst.Ref {
    const astgen = gz.astgen;
    const str_index = try astgen.identAsString(ident_token);
    const result = try gz.addStrTok(op_inst_tag, str_index, ident_token);
    return rvalue(gz, ri, result, node);
}