Changes

Remove dead code from S390Debug.cpp

Some of the unused methods from S390Debug.cpp have
builtin function calls that are unsupported by Open XL
and require inline assembly. As per recommendation,
removing these unused/dead code methods as there are
no other references to it outside.

Signed-off-by: Gaurav Chaudhari <gaurav.chaudhari@ibm.com>
 (commit: 196b35c)