Reapply:

Reapply:
r107173, "fix PR7519: after thrashing around and remembering how all this stuff"
r107216, "fix PR7523, which was caused by the ABI code calling ConvertType instead"

This includes a fix to make ConvertTypeForMem handle the "recursive" case, and call
it as such when lowering function types which have an indirect result.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107310 91177308-0d34-0410-b5e6-96231b3b80d8