[9] RFR(M): 7194669: CodeCache::mark_for_deoptimization should avoid verifying dependencies multiple times

[Roland Westrelin]

> As I recall running some nashorn benchmarks takes about 10X more time when using fastdebug VM if VerifyDependencies is not switched off.

Thanks Vladimir.
What about simply pushing the dependency signatures to an unsorted growableArray() and doing a linear search? Maybe that’s good enough?

Roland.