SOLARIS: save kernel module function arguments for debugging

SOLARIS: save kernel module function arguments for debugging

Add the -Wu,-save_args compiler option when building kernel modules
under Solaris 10 and 11 for the amd64 architecture.

Binaries generated with this option save function arguments on the stack
during function entry for debugging purposes. Up to six integer
arguments are saved on function entry, and are not modified during the
execution of the function.

[mmeffie: commit message update]

Reviewed-on: https://gerrit.openafs.org/12798
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 32d0493a7e4f74f5e5efdfde5eca29ed7d1bf3ec)

Change-Id: I478ce65da78b86aa3c13e1c615bafd51d0f5d567
Reviewed-on: https://gerrit.openafs.org/12903
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>