re/fold_grind.pl - rework so we don't double compile patterns

We were calling utf8::upgrade() on qr// objects, which works, in
that it stringifies the pattern, and then upgrades the string, and
the string can be used to match against. But it double compiles the
pattern, which is a bit unnecessary. For example

    $pat= qr/\x{DF}/;
    utf8::upgrade($pat); # $pat is now a string!
    "ss"=~/$pat/;        # and now $pat gets compiled again

works, but it does twice the work needed.

This was found by making utf8::upgrade() ignore refs.

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