RFR: Backport: 8216549: Mismatched unsafe access to non escaping object fails

[Roman Kennke]

This backports:
https://bugs.openjdk.java.net/browse/JDK-8216549

Original change:
hg.openjdk.java.net/jdk/jdk12/rev/f0490430ef7a

JDK11u backport:
http://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/d5fb6ad4203b

In order to make it work on 8u, I needed the extra change in
library_call.cpp. Thanks Roland who helped with this.

Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8216549-8u/webrev.00/

Testing:
The new testcase fails without the fix, and passes with the fix. tier1 &
tier2 show no regressions.

Can I please get a review?

Thanks,
Roman