Fix a buildbot warning triggered by 1dfb06d

GitOrigin-RevId: dcebe8ab1e26f8ea2fc91e12a20fadc5677407a0
diff --git a/lib/CodeGen/SpillPlacement.cpp b/lib/CodeGen/SpillPlacement.cpp
index b159751..6f91092 100644
--- a/lib/CodeGen/SpillPlacement.cpp
+++ b/lib/CodeGen/SpillPlacement.cpp
@@ -386,9 +386,8 @@
     case PrefSpill: return "PrefSpill";
     case PrefBoth: return "PrefBoth";
     case MustSpill: return "MustSpill";
-    default:
-      llvm_unreachable("uncovered switch");
     };
+    llvm_unreachable("uncovered switch");
   };
 
   dbgs() << "{" << Number << ", "