Remove some redundant branches

I think they were getting optimized out, but still

ConflictSet.cpp

@@ -939,6 +939,9 @@ template <class NodeT> int getChildGeqSimd(NodeT *self, int child) {
     }
     return -1;
   }
+  if (child > 255) {
+    return -1;
+  }
 
 #ifdef HAS_AVX
   __m128i key_vec = _mm_set1_epi8(child);
@@ -996,28 +999,12 @@ template <class NodeT> int getChildGeqSimd(NodeT *self, int child) {
 #endif
 }
 
-int getChildGeq(Node0 *, int child) {
-  if (child > 255) {
-    return -1;
-  }
-  return -1;
-}
-int getChildGeq(Node3 *self, int child) {
-  if (child > 255) {
-    return -1;
-  }
-  return getChildGeqSimd(self, child);
-}
+int getChildGeq(Node0 *, int) { return -1; }
+int getChildGeq(Node3 *self, int child) { return getChildGeqSimd(self, child); }
 int getChildGeq(Node16 *self, int child) {
-  if (child > 255) {
-    return -1;
-  }
   return getChildGeqSimd(self, child);
 }
 int getChildGeq(Node48 *self, int child) {
-  if (child > 255) {
-    return -1;
-  }
   return self->bitSet.firstSetGeq(child);
 }
 int getChildGeq(Node256 *self, int child) {