[jdk11u-dev] RFR: 8286444: javac errors after JDK-8251329 are not helpful enough to find root cause

[Christoph Langer]

Backport of JDK-8286444. Change did not apply cleanly but only copyright header needed resolving.

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Commit messages:
 - Backport 29c4b8e80d1860249a79cfd1941354150468fc5b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1117/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1117&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286444
  Stats: 7 lines in 1 file changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1117.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1117/head:pull/1117

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1117