Add accessors to isa_parser's VLEN/ELEN

riscv/isa_parser.h

@@ -102,12 +102,15 @@ public:
   unsigned get_max_xlen() const { return max_xlen; }
   reg_t get_max_isa() const { return max_isa; }
   std::string get_isa_string() const { return isa_string; }
+  reg_t get_vlen() const { return vlen; }
+  reg_t get_elen() const { return elen; }
   bool extension_enabled(unsigned char ext) const {
     return extension_enabled(isa_extension_t(ext));
   }
   bool extension_enabled(isa_extension_t ext) const {
     return extension_table[ext];
   }
+  bool has_any_vector() const { return vlen > 0; }
 
   std::bitset<NUM_ISA_EXTENSIONS> get_extension_table() const { return extension_table; }