[jdk11u-dev] RFR: 8289748: C2 compiled code crashes with SIGFPE with -XX:+StressLCM and -XX:+StressGCM

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle form 17.

in loopTransform, I had to adapt the make_cast() call because
ConstraintCastNode::UnconditionalDependency is not in 11.
I think 'true" is the right thing here.

Also I removed a test case becasue  -XX:StressSeed is not in 11.

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Commit messages:
 - Backport 2b5b9f59152e11ed76ce838e1e1e09b09b7a5206

Changes: https://git.openjdk.org/jdk11u-dev/pull/1951/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1951&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289748
  Stats: 73 lines in 2 files changed: 72 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1951.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1951/head:pull/1951

PR: https://git.openjdk.org/jdk11u-dev/pull/1951