simpleUnOp

fn simpleUnOp(
    gz: *GenZir,
    scope: *Scope,
    ri: ResultInfo,
    node: Ast.Node.Index,
    operand_ri: ResultInfo,
    operand_node: Ast.Node.Index,
    tag: Zir.Inst.Tag,
) InnerError!Zir.Inst.Ref {
    const cursor = maybeAdvanceSourceCursorToMainToken(gz, node);
    const operand = if (tag == .compile_error)
        try comptimeExpr(gz, scope, operand_ri, operand_node, .compile_error_string)
    else
        try expr(gz, scope, operand_ri, operand_node);
    switch (tag) {
        .tag_name, .error_name, .int_from_ptr => try emitDbgStmt(gz, cursor),
        else => {},
    }
    const result = try gz.addUnNode(tag, operand, node);
    return rvalue(gz, ri, result, node);
}