TLAB Refills for x86

[JC Beyler]

Hi all,

The TLAB and the inline contiguous allocations handling are different for
each architecture. On certain architectures, TLAB is never actually never
refilled (ref:  https://bugs.openjdk.java.net/browse/JDK-8190862).

The idea behind the implementation for x86 is to separate TLAB usage to
contiguous allocations in eden space.

Bug: https://bugs.openjdk.java.net/browse/JDK-8191027
WebRev: http://cr.openjdk.java.net/~rasbold/8191027/webrev.02/

Does anyone see any issues with this webrev?

Thanks for your help,
Jc