[jdk11u-dev] RFR: 8192864: defmeth tests can hide failures

[Amos Shi]

Backport of [JDK-8192864](https://bugs.openjdk.org/browse/JDK-8192864)

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Commit messages:
 - Backport 67d76fe937264361b180f286ce8be16cadace3d2

Changes: https://git.openjdk.org/jdk11u-dev/pull/2302/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2302&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8192864
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2302.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2302/head:pull/2302

PR: https://git.openjdk.org/jdk11u-dev/pull/2302