Revert "TableGen: Fix typeIsConvertibleTo for record types"

This reverts r325884.

Clang's TableGen has dependencies on the exact ordering of superclasses.
Revert this change fully for now to fix the build.

Change-Id: Ib297f5571cc7809f00838702ad7ab53d47335b26

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325891 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed