selftests: coredump: Add stackdump test

Add a test which checks that the kstkesp field in /proc/pid/stat can be
read for all threads of a coredumping process.

For full details including the motivat

selftests: coredump: Add stackdump test

Add a test which checks that the kstkesp field in /proc/pid/stat can be
read for all threads of a coredumping process.

For full details including the motivation for this test and how it works,
see the README file added by this commit.

Reviewed-by: John Ogness <[email protected]>
Signed-off-by: Nam Cao <[email protected]>
Link: https://lore.kernel.org/r/50e737b6576208566d14efcf1934fe840de6b1f4.1735805772.git.namcao@linutronix.de
Signed-off-by: Christian Brauner <[email protected]>

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