[jdk11u-dev] RFR: 8267399: C2: java/text/Normalizer/ConformanceTest.java test failed with assertion

[Martin Doerr]

Clean backport of JDK-8267399.

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Commit messages:
 - Backport 578c55bbe65baec733bb633afbc1423010fa6aed

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/125/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=125&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267399
  Stats: 75 lines in 2 files changed: 75 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/125.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/125/head:pull/125

PR: https://git.openjdk.java.net/jdk11u-dev/pull/125