RFR: 8347270: Remove unix_getParentPidAndTimings, unix_getChildren and unix_getCmdlineAndUserInfo [v3]

[Matthias Baesken]

> The functions unix_getParentPidAndTimings and unix_getCmdlineAndUserInfo in src/java.base/unix/native/libjava/ProcessHandleImpl_unix.c used to hold an implementation that was shared between Solaris and AIX. Linux and MacOS already had specific implementations. After the removal of the Solaris port, these two functions can be removed in favor of inline implementations of os_getParentPidAndTimings and os_getCmdlineAndUserInfo in src/java.base/aix/native/libjava/ProcessHandleImpl_aix.c.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  remove blank

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23013/files
  - new: https://git.openjdk.org/jdk/pull/23013/files/d4b539e6..4676494c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23013&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23013&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23013.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23013/head:pull/23013

PR: https://git.openjdk.org/jdk/pull/23013