[sanitizer] [SystemZ] Add/fix kernel and libc type definitions.

This is the first part of upcoming asan support for s390 and s390x.
Note that there are bits for 31-bit support in this and subsequent
patches - while LLVM itself doesn't support it, gcc should be able
to make use of it just fine.

Differential Revision: http://reviews.llvm.org/D18888

llvm-svn: 266370