Upgrade to Especially ^1.8.1 to fix math problems
Use fromIndex to make tests not loop for crazy-long

Thanks for the suggestion, @anba, in https://github.com/tc39/test262/issues/88.
Revert "Handle infinities explicitly"

This reverts commit ade9b121c53d6dd26370afd8a40eabc239009f5f.

After the upgrade to Especially ^1.8.1, abs and min now allow infinities, and thus ToLength will work when they are passed in, so this level of explicitness is not necessary.