Minor performance tweak.
Minor performance tweak.

Two minor tweaks:

1. Do not use ".indexOf()" three times for each comparison; do it just
   once.
2. Check the common case (no match) first.

These are very minor performance tweaks; but, with global link hints,
we pay this cost n times (for n frames).

willsALMANJ/vimium,poacher2k/vimium,poacher2k/vimium,philc/vimium,decaffeinate-examples/vimium,gdh1995/vimium,gdh1995/vimium,willsALMANJ/vimium,gdh1995/vimium,philc/vimium,poacher2k/vimium,philc/vimium,smblott-github/vimium,willsALMANJ/vimium,mrmr1993/vimium,smblott-github/vimium,mrmr1993/vimium,mrmr1993/vimium,decaffeinate-examples/vimium,decaffeinate-examples/vimium,smblott-github/vimium