RFR: improve profiled predicates

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/shenandoah/improved-profiled-predicates/webrev.00/

This change should make profiled predicates robuster:

- they now handle more control flow constructs
- instead of bailing out when profiling is missing, they assume it's an
  untaken path which allows frequencies to be computed on all
  paths
- they now support profiling data from lookupswitch/tableswitch (on Jump nodes)
- if a profiled predicate traps, the trap is recorded separately from
  regular predicate traps. The fallback will then be to recompile
  without profiled predicates but with regular predicates (instead of
  disabling predicates entirely). That change requires changing how
  traps are recorded and that's why there are small changes spread over
  so many files.

Roland.