Changes

Prevent commoning conversion to address operations in LocalCSE

OMR::LocalCSE::canBeAvailable was restricting l2a operations from being
commoned to reduce the likelihood that a register holding the result of
such an operation would be marked as a collected reference and kept live
across a GC point by l2aEvaluator.  To be safest, all conversion to
address types should be similarly prevented from being commoned.
 (commit: 8f4b357)