[PowerPC] Add missing build dependency

This (hopefully) fixes build failures resulting from r184436;
the PowerPC asm parser now depends on PowerPC target expresssions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184439 91177308-0d34-0410-b5e6-96231b3b80d8
Change the debug type to match the debug type that is used by vecutils.cpp.
This change makes it easier to filter debug messages.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184440 91177308-0d34-0410-b5e6-96231b3b80d8