RFR: 8317515: Unify the code of the parse*() families of methods in j.l.Integer and j.l.Long [v3]

[Raffaello Giulietti]

> See the [JBS issue](https://bugs.openjdk.org/browse/JDK-8317515) for the details.

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

  Using compareUnsigned() rather than open logic.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16050/files
  - new: https://git.openjdk.org/jdk/pull/16050/files/bb4cc608..838d6f81

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16050&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16050&range=01-02

  Stats: 8 lines in 2 files changed: 0 ins; 4 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/16050.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16050/head:pull/16050

PR: https://git.openjdk.org/jdk/pull/16050