[8u] RFR (S) 8218201: Failures when vmIntrinsics::_getClass is not inlined

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8218201
  https://hg.openjdk.java.net/jdk/jdk/rev/a2d3ca8062b9

8u version needs a few adjustments, because context is a bit different. The new change should be
functionally equivalent to what we have in jdk/jdk. 8u webrev:
  https://cr.openjdk.java.net/~shade/8218201/webrev.8u.01/

Testing: affected test (fails without the patch, passes with it); tier1

-- 
Thanks,
-Aleksey