RFR: 8374341: Use of "\s" instead of "\\s" in CoreUtils.java results in splitting on backspace instead of whitespace [v3]

[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:

  JDK-8374341: Remove unverified systemd-coredump handling code

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28984/files
  - new: https://git.openjdk.org/jdk/pull/28984/files/a7596fa4..cc6e5f6b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28984&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28984&range=01-02

  Stats: 24 lines in 1 file changed: 0 ins; 24 del; 0 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