[8u40] backport RFR (XS) 8066199: C2 escape analysis prevents VM from exiting quickly

[Vladimir Kozlov]

8u40 backport request.  Changes were pushed into jdk9 yesterday, no 
problems were found since then. Changes are applied to 8u cleanly.

http://cr.openjdk.java.net/~kvn/8066199/webrev/
https://bugs.openjdk.java.net/browse/JDK-8066199
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/1266b02f32fe

Thanks,
Vladimir