Use "--keep-debuginfo=yes" for valgrind testing

ivtest/run_ivl.py

@@ -23,7 +23,8 @@ def assemble_vvp_cmd(options: dict, cfg: dict) -> list:
     '''Build the vvp command line'''
     res = []
     if cfg['with-valgrind']:
-        res += ["valgrind", "--leak-check=full", "--show-reachable=yes"]
+        res += ["valgrind", "--leak-check=full", "--keep-debuginfo=yes",
+                            "--show-reachable=yes"]
     res += ["vvp"+cfg['suffix']]
     res += options['vvp_args']
     res.append(os.path.join("work", "a.out"))

ivtest/vvp_reg.pl

@@ -173,6 +173,7 @@ sub execute_regression {
         }
 
         $cmd = $with_valg ? "valgrind --leak-check=full " .
+                            "--keep-debuginfo=yes " .
                             "--show-reachable=yes " : "";
         $cmd .= "vvp$sfx vsim $vvp_args $plargs{$tname}";
 #        print "$cmd\n";