kristina added inline comments.

================
Comment at: lib/Lex/PPDirectives.cpp:1898
+          }
+          if (Filename.empty())
+            return Filename;
----------------
sammccall wrote:
> simplify the logic by merging with the while loop? (and drop the assert)
I thought the assert was a good idea in case a similar issue popped up again 
(somehow triggering this but in reverse, not sure if that makes sense), it's a 
no-op in upstream release builds anyway.


Repository:
  rC Clang

https://reviews.llvm.org/D52721



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