[jdk11u-dev] Integrated: 8266288: assert root method not found in witnessed_reabstraction_in_supers is too strong

[Aleksey Shipilev]

Clean backport.

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Commit messages:
 - Backport 49d04586ed27fc905083d60aa68793d84824c7f3

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/35/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=35&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266288
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/35.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/35/head:pull/35

PR: https://git.openjdk.java.net/jdk11u-dev/pull/35