[jdk11u-dev] RFR: 8277029: JMM GetDiagnosticXXXInfo APIs should verify output array sizes

[Thomas Stuefe]

Hi all,

this pull request contains a backport of commit b8d33a2a from the openjdk/jdk repository.

I'd like to backport this patch to jdk11. 

Most relevant this is for jdk11, to prevent difficult-to-spot downport errors early (the DCmd framework is different, which exposes authors of dcmd to surprising bugs - this downport helps prevent that).

Thanks!

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Commit messages:
 - Backport b8d33a2a4e4ac1be322644102e8f09ce1435b4fb

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/635/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=635&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277029
  Stats: 9 lines in 3 files changed: 3 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/635.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/635/head:pull/635

PR: https://git.openjdk.java.net/jdk11u-dev/pull/635