[PATCH] Fix ARM HVA classification of classes with non-virtual bases

[Reid Kleckner]

Hi uweigand, t.p.northover,

Reuse the PPC64 HVA detection algorithm for ARM and AArch64. This is a
nice code deduplication, since they are roughly identical. A few virtual
method extension points are needed to understand how big an HVA can be
and what element types it can have for a given architecture.

Also make the record expansion code work in the presence of non-virtual
bases.

http://reviews.llvm.org/D6045

Files:
  lib/CodeGen/ABIInfo.h
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/TargetInfo.cpp
  test/CodeGen/ppc64le-aggregates-cpp.cpp
  test/CodeGen/ppc64le-aggregates.c
  test/CodeGenCXX/homogeneous-aggregates.cpp
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