[8u40] backport RFR(XS) 8059780: SPECjvm2008-MPEG performance regressions on x64 platforms

[Vladimir Kozlov]

Backport request. Changes were pushed into jdk9 2 days ago. Nighties are 
fine. Changes are applied cleanly to 8u sources.

http://cr.openjdk.java.net/~kvn/8059780/webrev/

https://bugs.openjdk.java.net/browse/JDK-8059780

http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/b8bcacc8ccca

Thanks,
Vladimir