RFR (S): 8023158 - hotspot/test/gc/7168848/HumongousAlloc.java fails 14 full gcs, expect 0 full gcs

[Per Liden]

Hi!

http://cr.openjdk.java.net/~pliden/8023158/webrev.01/

https://bugs.openjdk.java.net/browse/JDK-8023158

Summary: A side effect of fixing JDK-8020155 was that the HumongousAlloc 
test for G1 broke. This test is designed to make sure than an allocation 
of an humongous object initiates a mark phase if that allocation pushes 
the heap size above InitiatingHeapOccupancyPercent. Due to the changes 
made in JDK-8020155 this test fails since it instead provokes Full GCs. 
This patch fixes the test. Also renamed the test according to the new 
naming schema.

/Per