Fixes build in Debug mode on linux

The changes introduced in commit 80294e1 makes the mcdisassembler
component of LLVM necessary in debug mode to successfully link rpcs3.
Merge pull request #864 from devmapal/master

Fixes build in Debug mode on linux
Check address is not null for cellGcmAddressToOffset
Merge pull request #867 from raven02/patch-7

Check address is not null for cellGcmAddressToOffset