RFR: 8294985: SSLEngine throws IAE during parsing of X500Principal [v12]

[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:

  optimize imports and change toString

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13466/files
  - new: https://git.openjdk.org/jdk/pull/13466/files/5a20371e..e33a9b0b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13466&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13466&range=10-11

  Stats: 33 lines in 2 files changed: 14 ins; 5 del; 14 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