rjmccall added inline comments.

================
Comment at: clang/lib/AST/ItaniumMangle.cpp:2342
+  if (isa<AutoType>(Ty))
+    return false;
   return true;
----------------
rjmccall wrote:
> I agree with your analysis that this shouldn't be a substitution candidate.  
> However, I think this probably needs an ABI-compatibility guard.
You should probably add a comment like "Prior to LLVM v6, Clang accidentally 
treated deduced auto types as substitution candidates."


https://reviews.llvm.org/D45451



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