[8u60] Backport RFR: 8006960: hotspot, "impossible" assertion failure

[Tobias Hartmann]

Hi,

please review the following backport request for 8u60.

8006960: hotspot, "impossible" assertion failure
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/16a66b3338de
http://cr.openjdk.java.net/~thartmann/8006960/webrev.00/

The changes were pushed to JDK 9 a week ago and nightly testing showed no problems. The patch applies cleanly to 8u60.

Thanks,
Tobias