RFR (M): 8216314: SIGILL in CodeHeapState::print_names()

[Schmidt, Lutz]

Dear all,

may I please request reviews for this fix, hardening CodeHeap Analytics to not fail when used in high-load (stress) scenarios. There was quite a bit of preliminary discussion, all documented in the "Comments" section of the bug.

Bug:    https://bugs.openjdk.java.net/browse/JDK-8216314 
Webrev: http://cr.openjdk.java.net/~lucy/webrevs/8216314.01/ 

Thank you!
Lutz