Fixing a build error.

llvm-svn: 217983

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index d9c91001973..cb4b09cbaf0 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -52,7 +52,7 @@ static bool ignoreCallingConv(LibFunc::Func Func) {
   default:
     return false;
   }
-  llvm_unreachable();
+  llvm_unreachable("All cases should be covered in the switch.");
 }
 
 /// isOnlyUsedInZeroEqualityComparison - Return true if it only matters that the