RFR(M): 8190430 [MVT] Fixing GC support for Thread-local value buffers

[Frederic Parain]

Updated webrev where the memory allocation for the TLVB is changed from
on-demand mmap() calls to a reserve/lazy commits mechanism.

http://cr.openjdk.java.net/~fparain/8190430/webrev.01/

Fred


> On Oct 31, 2017, at 13:21, Frederic Parain <frederic.parain at oracle.com> wrote:
> 
> Please review this changeset fixing the GC support and other
> issues with the Thread-Local Value Buffer:
> 
> http://cr.openjdk.java.net/~fparain/8190430/webrev.00/
> 
> This changeset re-activates the TLVB by default.
> The VTBuffer test has been fixed to generate value types
> with object references.
> 
> All hotspot_valhalla tests pass.
> 
> Thank you,
> 
> Fred