RFR (XS) 8220290: gc_epilogue(full = false) is called on Full GC path after JDK-8215221

[Kim Barrett]

> On Mar 7, 2019, at 1:05 PM, Aleksey Shipilev <shade at redhat.com> wrote:
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8220290
> 
> Fix:
> http://cr.openjdk.java.net/~shade/8220290/webrev.01/
> 
> This regression is caused by recent refactoring in JDK-8215221. The comments in the bug should
> describe what happened.
> 
> Testing: Linux x86_64 fastdebug: 20 rounds of gc/arguments/TestSurvivorRatioFlag with CMS, 5 rounds
> of hotspot/gc with {Serial, Parallel, CMS}, hotspot tier1, jdk-submit (in progress)
> 
> -Aleksey

Looks good.  Sorry I missed this while reviewing JDK-8215221.