r355294 - Modules: Document that ReadASTCore exits its final loop via `return`, NFC

[Duncan P. N. Exon Smith via cfe-commits]

Author: dexonsmith
Date: Sun Mar  3 12:17:53 2019
New Revision: 355294

URL: http://llvm.org/viewvc/llvm-project?rev=355294&view=rev
Log:
Modules: Document that ReadASTCore exits its final loop via `return`, NFC

The final loop never breaks.  Document that by following it with
llvm_unreachable.

Modified:
    cfe/trunk/lib/Serialization/ASTReader.cpp

Modified: cfe/trunk/lib/Serialization/ASTReader.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Serialization/ASTReader.cpp?rev=355294&r1=355293&r2=355294&view=diff
==============================================================================
--- cfe/trunk/lib/Serialization/ASTReader.cpp (original)
+++ cfe/trunk/lib/Serialization/ASTReader.cpp Sun Mar  3 12:17:53 2019
@@ -4257,7 +4257,7 @@ ASTReader::ReadASTCore(StringRef FileNam
     }
   }
 
-  return Success;
+  llvm_unreachable("unexpected break; expected return");
 }
 
 ASTReader::ASTReadResult