RFR: 8294985: SSLEngine throws IAE during parsing of X500Principal [v18]

[Kevin Driver]

> Fixes: [JDK-8294985](https://bugs.openjdk.org/browse/JDK-8294985)

Kevin Driver has updated the pull request incrementally with one additional commit since the last revision:

  additional code review comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13466/files
  - new: https://git.openjdk.org/jdk/pull/13466/files/8b672b0c..10c18fa1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13466&range=17
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13466&range=16-17

  Stats: 12 lines in 1 file changed: 2 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/13466.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13466/head:pull/13466

PR: https://git.openjdk.org/jdk/pull/13466