RFR [10] 2018-03-12: Bulk backports to sh/jdk10

[Roman Kennke]

Am 12.03.2018 um 18:21 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk10-20180312/webrev.01/
> 
> This backports last week's changes to sh/jdk10.
> 
> 46caecb58216: [backport] Use current time instead of DBL_MAX for immediate uncommit
> eac60de937c2: [backport] Excessive assert in ShHeap::mark_next
> b3446fc50093: [backport] Eliminate write-barrier assembly stub (part 1)
> 58279d273cc4: [backport] Degenerated GC: rename enum, report degen reasons in stats
> 0e32109905c8: [backport] Use os::naked_short_sleep instead of naked Thread events for sleeping
> 6d92c949ae62: [backport] No need for fence in control loop: flags are now ShSharedVariables
> 35f512e2f57f: [backport] Implement protocol for safe OOM during evacuation handling
> 125606c17be3: [backport] Minor cleanups
> 51fc1ad2dbff: [backport] Make control loop more responsive under allocation pressure
> 232c31483a6b: [backport] Split live data management for allocations and GCs
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 

Looks good. Thanks!
Roman