[jdk15u-dev] RFR: 8256809: Annotation processing causes NPE during flow analysis

[Ekaterina Vergizova]

I'd like to backport JDK-8256809 to 15u for parity with 11u.
The patch applies cleanly.
Tested with tier1; new test fails without the patch, passes with it.

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Commit messages:
 - Backport 8ddf5e172b5d3fcd0aafa50c9019ee16ef038825

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/59/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=59&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256809
  Stats: 160 lines in 2 files changed: 159 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/59.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/59/head:pull/59

PR: https://git.openjdk.java.net/jdk15u-dev/pull/59