git: openjdk/jdk-sandbox: jcmd_cores_process_revival: Remove use of system for file copy on Linux, use sendfile. Remove diagnostic pmap call.

[duke]

Changeset: f23d6551
Branch: jcmd_cores_process_revival
Author:    Kevin Walls <kevin.walls at oracle.com>
Date:      2026-01-27 12:19:39 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/f23d655195a8c6c3622427964e10198cf7f494b0

Remove use of system for file copy on Linux, use sendfile.  Remove diagnostic pmap call.

! src/java.base/linux/native/revivalhelper/revival_linux.cpp
! src/java.base/share/native/revivalhelper/revival.cpp
! src/java.base/share/native/revivalhelper/revival.hpp
! src/java.base/windows/native/revivalhelper/revival_windows.cpp