Remove Node::Invalid

ConflictSet.cpp

@@ -225,13 +225,12 @@ enum class Type : int8_t {
   Node16,
   Node48,
   Node256,
-  Invalid,
 };
 
 constexpr static int kPartialKeyMaxLenEntryPresent = 24;
 
 struct Node {
-  Type type = Type::Invalid;
+  Type type;
 
   /* begin section that's copied to the next node */
   bool entryPresent = false;
@@ -667,8 +666,6 @@ void eraseChild(Node *self, uint8_t index, NodeAllocators *allocators) {
   case Type::Node256:
     allocators->node256.release((Node256 *)child);
     break;
-  case Type::Invalid:
-    __builtin_unreachable(); // GCOVR_EXCL_LINE
   }
 
   if (self->type <= Type::Node16) {
@@ -1074,8 +1071,6 @@ int64_t maxBetweenExclusive(Node *n, int begin, int end) {
         begin, end);
     break;
   }
-  case Type::Invalid:
-    __builtin_unreachable(); // GCOVR_EXCL_LINE
   }
 #if DEBUG_VERBOSE && !defined(NDEBUG)
   fprintf(stderr, "At `%s', max version in (%02x, %02x) is %" PRId64 "\n",