[jdk17u-dev] RFR: 8300207: Add a pre-check for the number of canonical equivalent permutations in j.u.r.Pattern

[Goetz Lindenmaier]

I backport this for parity with 17.0.17-oracle.

Removed some comments as required by CSR

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Commit messages:
 - Remove doc as required by CSR
 - Backport 030b071db1fb6197a2633a04b20aa95432a903bc

Changes: https://git.openjdk.org/jdk17u-dev/pull/3765/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3765&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300207
  Stats: 32 lines in 1 file changed: 27 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3765.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3765/head:pull/3765

PR: https://git.openjdk.org/jdk17u-dev/pull/3765