[PowerPC ABI] Bug 21398 - Consider C++ base classes in HA classification

As discussed in bug 21398, PowerPC ABI code needs to consider C++ base
classes when classifying a class as homogeneous aggregate (or not) for
ABI purposes.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220852 91177308-0d34-0410-b5e6-96231b3b80d8