Merge pull request #301 from RISCVERS/fix-snapshot

snapshot: use VerilatedSerialize for verilator v4.106

src/test/csrc/snapshot.h

@@ -5,7 +5,7 @@
 #include "VXSSimSoC.h"
 #include <verilated_save.h>
 
-class VerilatedSaveMem : public VerilatedSave {
+class VerilatedSaveMem : public VerilatedSerialize {
   const static long buf_size = 1024 * 1024 * 1024;
   uint8_t *buf;
   long size;