Index: source/Plugins/Process/Utility/ARMDefines.h
===================================================================
--- source/Plugins/Process/Utility/ARMDefines.h
+++ source/Plugins/Process/Utility/ARMDefines.h
@@ -9,6 +9,8 @@
 #ifndef lldb_ARMDefines_h_
 #define lldb_ARMDefines_h_
 
+#include "llvm/Support/ErrorHandling.h"
+
 #include <cassert>
 #include <cstdint>
 
@@ -69,7 +71,7 @@
 static inline const char *ARMCondCodeToString(uint32_t CC) {
   switch (CC) {
   default:
-    assert(0 && "Unknown condition code");
+    llvm_unreachable("Unknown condition code");
   case COND_EQ:
     return "eq";
   case COND_NE: