use cppcheck::unreachable()

Author: firewave

lib/errortypes.cpp

@@ -69,7 +69,7 @@ std::string severityToString(Severity severity)
     case Severity::internal:
         return "internal";
     }
-    throw InternalError(nullptr, "Unknown severity");
+    cppcheck::unreachable();
 }
 
 // TODO: bail out on invalid severity

lib/vfvalue.cpp

@@ -129,7 +129,7 @@ namespace ValueFlow {
             return result;
         }
         }
-        throw InternalError(nullptr, "Invalid ValueFlow Value type");
+        cppcheck::unreachable();
     }
 
     const char *Value::toString(MoveKind moveKind) {