RFR (S): 7167254: Crash on OSX in Enumerator.nextElement() with compressed oops

[Roland Westrelin]

Hi Karen,

> Does this fix either of the following SIGBUS on Mac bugs?
>
> 7129715 (this is the one where it also lists "An irrecoverable stack overflow has occurred,
>   which is where my other question came from - is there a place where we look for
>   SIGSEGV for stack overflow and also need to look for SIGBUS" - I didn't track the code
>   path yet)
> 			Test name: gc/gctests/JumbleGC002 ( see the jira link)

This one still reproduces with my change.

> 7129716 (probably just a duplicate of the one you just fixed)
>Hotspot regression tests compiler/6865031/Test.java
> fails on MacOS if run with -Xcomp:

This one is a duplicate of my bug. I closed it.

Roland.