This also fixes a problem occurring with ASM 6.2, in which the
TryCatchBlockSorter (which the AdvancedSorter used) introduced a
run-time check to prevent subclassing.

But because AdvancedSorter never really used the TryCatchBlockSorter
implementation of sorting, it was replaced with an implementation that
just sorts the try-catch blocks and ensures that they don't overlap.