RFR: 8374341: Fix whitespace split in CoreUtils.getCoreFileLocation [v2]

[eunbin son]

> ### Summary
> Fix incorrect regex usage in CoreUtils.getCoreFileLocation.
> 
> ### Description
> CoreUtils.getCoreFileLocation uses String.split("\s", 2).
> The string literal "\s" represents a backspace character, not a whitespace regex.
> As a result, the split operation does not separate fields on whitespace.
> This change replaces the pattern with "\\s+" to correctly split on whitespace.
> No other logic is modified.
> 
> ### Bug ID :  JDK-8374341 
> https://bugs.java.com/bugdatabase/view_bug?bug_id=8374341

eunbin son has updated the pull request incrementally with one additional commit since the last revision:

  8374341: Update copyright year to 2025 for CoreUtils.java

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28984/files
  - new: https://git.openjdk.org/jdk/pull/28984/files/9f960957..a7596fa4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28984&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28984&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28984.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28984/head:pull/28984

PR: https://git.openjdk.org/jdk/pull/28984