Fixed some issues where we might not have one of the new apple accelerator

tables (like the .apple_namespaces) and it would cause us to index DWARF that
didn't need to be indexed.

Updated the MappedHash.h (generic Apple accelerator table) and the DWARF
specific one (HashedNameToDIE.h) to be up to date with the latest and
greatest hash table format.

llvm-svn: 142627