[jdk11u-dev] RFR: 8342496: C2/Shenandoah: SEGV in compiled code when running jcstress

[Radek Cap]

Backport of JDK-8342496 - C2/Shenandoah: SEGV in compiled code when running jcstress

It's fixing the java/lang/invoke/PrivateInvokeTest.java#PrivateInvokeTest failure.

Clean backport. 
Passed tier 1 tests. 
Passed gtests.

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Commit messages:
 - Backport 955bae2b03055552237584aa7c68b1afcfa3b9c1

Changes: https://git.openjdk.org/jdk11u-dev/pull/2995/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2995&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342496
  Stats: 70 lines in 2 files changed: 70 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2995.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2995/head:pull/2995

PR: https://git.openjdk.org/jdk11u-dev/pull/2995