RFR: 8274925: Shenandoah: shenandoah/TestAllocHumongousFragment.java test failed on lock rank check [v2]

[Zhengyu Gu]

> JDK-8273917 lowered MultiArray_lock rank from nonleaf+2 to nonleaf, that results several Shenandoah tests failed on lock rank check.
> 
> This patch lowers ShenandoahAllocFailureGC_lock rank by 2 to maintain original order.
> 
> 
> Test:
> 
> - [x] hotspot_gc_shenandoah

Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:

  Aleksey's comment

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5865/files
  - new: https://git.openjdk.java.net/jdk/pull/5865/files/bad7be7c..c224b441

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5865&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5865&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5865.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5865/head:pull/5865

PR: https://git.openjdk.java.net/jdk/pull/5865