More dead code removal (using -Wunreachable-code)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148577 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ScanfFormatString.cpp b/lib/Analysis/ScanfFormatString.cpp
index d5a44cb..38afd61 100644
--- a/lib/Analysis/ScanfFormatString.cpp
+++ b/lib/Analysis/ScanfFormatString.cpp
@@ -462,7 +462,7 @@
     }
   }
 
-  return false; // Unreachable, but we still get a warning.
+  llvm_unreachable("Invalid ScanfArgTypeResult Kind!");
 }
 
 QualType ScanfArgTypeResult::getRepresentativeType(ASTContext &C) const {
@@ -479,7 +479,7 @@
       return C.getPointerType(A.getRepresentativeType(C));
   }
 
-  return QualType(); // Not reachable.
+  llvm_unreachable("Invalid ScanfArgTypeResult Kind!");
 }
 
 std::string ScanfArgTypeResult::getRepresentativeTypeName(ASTContext& C) const {