bug#7921: 23.2.91; js-mode font lock problem with comments

[Deniz Dogan]

I can reproduce this with only js-mode and all the HTML removed from
the example. Other reproducible issues, modifying the line ending with
path=/"; are:

path=/";/ # Everything following and including the last / is string face
path="; # Everything is fine
path=//"; # Everything is fine

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Deniz Dogan