hashlib: Add some more primes

* Add some primes as suggested in YosysHQ#4458. This allows larger hashtables
  to be allocated for very big designs

kernel/hashlib.h

@@ -188,6 +188,7 @@ inline unsigned int mkhash(const T &v) {
 
 inline int hashtable_size(int min_size)
 {
+	// Primes as generated by https://oeis.org/A175953
 	static std::vector<int> zero_and_some_primes = {
 		0, 23, 29, 37, 47, 59, 79, 101, 127, 163, 211, 269, 337, 431, 541, 677,
 		853, 1069, 1361, 1709, 2137, 2677, 3347, 4201, 5261, 6577, 8231, 10289,
@@ -196,7 +197,8 @@ inline int hashtable_size(int min_size)
 		897133, 1121423, 1401791, 1752239, 2190299, 2737937, 3422429, 4278037,
 		5347553, 6684443, 8355563, 10444457, 13055587, 16319519, 20399411,
 		25499291, 31874149, 39842687, 49803361, 62254207, 77817767, 97272239,
-		121590311, 151987889, 189984863, 237481091, 296851369, 371064217
+		121590311, 151987889, 189984863, 237481091, 296851369, 371064217,
+		463830273, 579787849, 724734817, 905918527, 1132398207, 1415497781,
 	};
 
 	for (auto p : zero_and_some_primes)