[PATCH] PowerPC, add support for recording pipe2 system call.

[Tom Tromey]

Carl> GCC maintainers:

Hmmm.... :)

Carl> The pipe2 system call support for gdb record is missing.  The missing
Carl> support results in gdb.reverse/pipe-reverse.exp a single test failure.

Carl> This patch adds the needed support for the pipe2 system call on Power
Carl> 10 with the Fedora 36 distro.

Carl> The patch has been tested on Power 10 with no regression failures.

Carl> Please let me know if this patch is acceptable for mainline.  Thanks.

Looks good to me.  Thank you for doing this.

Tom