[jdk17u-dev] RFR: 8299677: Formatter.format might take a long time to format an integer or floating-point

[Paul Hohensee]

Simple almost clean backport of a potential DOS attack vector fix. Changed

Flags.contains(f, Flags.ZERO_PAD)

to

f.contains(Flags.ZERO_PAD)

Passes new and old Formatter tests.

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Commit messages:
 - Backport 33412c102ce799ff2de3512df77e6e07d76acd36

Changes: https://git.openjdk.org/jdk17u-dev/pull/1077/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1077&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299677
  Stats: 318 lines in 2 files changed: 313 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1077.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1077/head:pull/1077

PR: https://git.openjdk.org/jdk17u-dev/pull/1077