Also add trivial handling of transparent unions.
PPC32, MSP430, and XCore apparently all rely on DefaultABIInfo. This
should worry you, because DefaultABIInfo is not implementing the rules
of any particular ABI.
Fixes PR23097, patch by Andy Gibbs.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@237630 91177308-0d34-0410-b5e6-96231b3b80d8
Reid Kleckner