This reverts commit r242302. External type refs of this form were never used by any LLVM frontend so this is effectively dead code. (They were introduced to support clang module debug info, but in the end we came up with a better design that doesn't use this feature at all.) rdar://problem/25897929 Differential Revision: https://reviews.llvm.org/D30917 llvm-svn: 297684
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