[jdk11u-dev] RFR: 8268362: [REDO] C2 crash when compile negative Arrays.copyOf length after loop

[Martin Doerr]

Clean backport of JDK-8268362.

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Commit messages:
 - Backport 22ebd1926d4510cbe40cb186edf16cbd44a29347

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/132/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=132&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268362
  Stats: 240 lines in 7 files changed: 224 ins; 13 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/132.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/132/head:pull/132

PR: https://git.openjdk.java.net/jdk11u-dev/pull/132