RFR: 8300207: Add a pre-check for the number of canonical equivalent permutations in j.u.r.Pattern [v2]

[Raffaello Giulietti]

> - Strengthen a computation that could overflow.
> - Specify that use of CANON_EQ could exhaust memory in the compilation phase.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

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

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12027/files
  - new: https://git.openjdk.org/jdk/pull/12027/files/8ae8f86e..64c2dfc3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12027&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12027&range=00-01

  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12027.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12027/head:pull/12027

PR: https://git.openjdk.org/jdk/pull/12027