[ob] remove stale comments about permanent breakpoints

[Vladimir Prus]

I've noticed that insert_breakpoints/insert_bp_location have
comments about not inserting permanent breakpoints. Those comments
are stale -- the permanent breakpoints are not inserted because
bp_location has 'inserted' field set to 1, not for any other reason.
The comment also say that we don't insert disabled breakpoints, but
that fact is obvious from the code anyway.

This patch, checked in as obvious, removes those comments.

- Volodya


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