pp_match(): combine intuit and regexec branches

pp_match(): combine intuit and regexec branches

There was some code that looked roughly like:

    if (can_match_on_intuit_only) {
        ....
        goto yup;
    }
    if (!regexec())
        goto ret_no;

  gotcha:
    A; B;
    if (simple)
        RETURNYES;
    X; Y;
    RETURN;

  yup:
    A;
    if (!simple)
        goto gotcha;
    B;
    RETURNYES

Refactor it to look like

    if (can_match_on_intuit_only) {
        ....
        goto gotcha;
    }
    if (!regexec())
        goto ret_no;

  gotcha:
    A; B;
    if (simple)
        RETURNYES;
    X; Y;
    RETURN;

As well as simplifying the code, it also avoids duplicating some work
(the 'A' above was done twice sometimes) - harmless but less efficient.