Fix "not all control paths return a value" MSVC warning. NFCI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332238 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/IR/Core.cpp b/lib/IR/Core.cpp
index 0ccf06a..02311db 100644 (file)
--- a/lib/IR/Core.cpp
+++ b/lib/IR/Core.cpp
@@ -290,6 +290,7 @@ map_to_llvmModFlagBehavior(LLVMModuleFlagBehavior Behavior) {
   case LLVMModuleFlagBehaviorAppendUnique:
     return Module::ModFlagBehavior::AppendUnique;
   }
+  llvm_unreachable("Unknown LLVMModuleFlagBehavior");
 }
 
 static LLVMModuleFlagBehavior