[jdk17u] RFR: 8268894: forged ASTs can provoke an AIOOBE at com.sun.tools.javac.jvm.ClassWriter::writePosition

[Guoxiong Li]

Hi all,

I would like to backport this trivial change to jdk17u. The code applies cleanly and the tag `jdk17u-fix-request` was added.

this pull request contains a backport of commit a9188f23 from the openjdk/jdk repository.

The commit being backported was authored by Guoxiong Li on 29 Aug 2021 and was reviewed by Vicente Romero.

Best Regards,
-- Guoxiong

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Commit messages:
 - Backport a9188f237ec23d4ca2a172e9a7897cb6e2b69857

Changes: https://git.openjdk.java.net/jdk17u/pull/93/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=93&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268894
  Stats: 134 lines in 3 files changed: 133 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/93.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/93/head:pull/93

PR: https://git.openjdk.java.net/jdk17u/pull/93