In the fix for 6385730 we changed LoadKlass and LoadRange to use the
starting memory to indicate that they could be commoned across the
whole compile since they are essentially loading from immutable
memory. Unfortunately this can lead to incorrect anti dependence
computations because the LoadKlass may have an input which is using a
different memory. LoadRange and most LoadKlasses are protected from
this problem because they are considered to use memory which is not
rewritable and so the anti dep computation logic is skipped in it's
entirety. When LoadKlass is used to read from the cache other parts
of the klass it may not be considered !rewritable so we end up in the
anti dep logic. The fix I'm proposing is to make these nodes are not
requiring anti dep check at all.

Tested with failing test case. Also ran CTW and runthese.