RFR: 8364781: Re-examine DigitList digits resizing during parsing [v2]

[Justin Lu]

> This PR changes the DigitList resizing from adding increments of 100 to a doubling resizing approach. This helps with performance of larger String values during `DecimalFormat` parsing. See the comment on the associated JBS issue for further detail.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  Chen review - replace with ArraysSupport

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26705/files
  - new: https://git.openjdk.org/jdk/pull/26705/files/4361aa02..df40560e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26705&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26705&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26705.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26705/head:pull/26705

PR: https://git.openjdk.org/jdk/pull/26705