hg: valhalla/valhalla: Pass the lookupClass through to the VM and switch to the nest-host on the VM side so

[david.holmes at oracle.com]

Changeset: 8c1871e941dc
Author:    dholmes
Date:      2018-11-07 23:02 -0500
URL:       http://hg.openjdk.java.net/valhalla/valhalla/rev/8c1871e941dc

Pass the lookupClass through to the VM and switch to the nest-host on the VM side so
that all vaildation exceptions are thrown as expected and we only ever set a valid
nest host.
Reviewed-by: mchung

! src/hotspot/share/prims/jvm.cpp
! src/java.base/share/classes/java/lang/invoke/MethodHandles.java