RFR 8049105: Move array component mirror to instance of java/lang/Class (hotspot part 2)

[Coleen Phillimore]

Summary: This removes component mirrors from arrayKlass metadata and the 
C2 intrinsic for them.

I'm sending this out to hotspot-dev so I can get someone from the 
compiler to review this (again).  Chris Thalinger, you already saw this 
once, it's the same thing, but I had to hold this change until it was 
okay'd by licensees.   Can you re-review?

Also GC team note that Klass::oops_do() is now non-virtual.  Will that help?

Tested with jck, nsk and jtreg tests.  Also, ran refworkload with no 
difference in performance.

open webrev at http://cr.openjdk.java.net/~coleenp/8049105/
bug link https://bugs.openjdk.java.net/browse/JDK-8049105

Thanks,
Coleen