RFR: 6177299: [Fmt-Nu] NumberFormat.getPercentInstance() does not work correctly [v2]

[Justin Lu]

> Please review this PR which corrects an edge case bug for `DecimalFormat` parsing when a multiplier is applied.
> 
> This issue applies to any parsed Strings whose resultant double value is rounded to _9.223372036854776E18_ after the multiplier is applied. The returned value is incorrectly given as `Long.MAX_VALUE` when it should be returned as the double _9.223372036854776E18_.
> 
> For example, the String _"922,337,203,685,477,600,000%"_ is first parsed as _9.223372036854776E20_, after which the multiplier is then applied to give _9.223372036854776E18_. The original code evaluates `9.223372036854776E18 == (double)(long)9.223372036854776E18` as true, leading to the long representation returned.
> 
> The double value should first be checked if it is within the long min/max range before being checked if it can be represented as a long. Note that the check should be inclusive, as during the comparison, `Long.MAX_VALUE` is promoted to _9.223372036854776E18_. Thus _9.223372036854775E18_ correctly compares as false, and all doubles above compare as true.

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

  Naoto review - move test to NR.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27563/files
  - new: https://git.openjdk.org/jdk/pull/27563/files/fc00ec3b..d24e6dff

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27563&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27563&range=00-01

  Stats: 66 lines in 2 files changed: 39 ins; 24 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27563.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27563/head:pull/27563

PR: https://git.openjdk.org/jdk/pull/27563