remove debugging statements

h2/src/main/org/h2/engine/Session.java

@@ -831,7 +831,6 @@ public class Session extends SessionWithState {
     public void setLastIdentity(Value last) {
         this.lastIdentity = last;
         this.lastScopeIdentity = last;
-        new Throwable("lastScopeIdentity=" + last).printStackTrace();
     }
 
     public Value getLastIdentity() {
@@ -840,7 +839,6 @@ public class Session extends SessionWithState {
 
     public void setLastScopeIdentity(Value last) {
         this.lastScopeIdentity = last;
-        new Throwable("lastScopeIdentity=" + last).printStackTrace();
     }
 
     public Value getLastScopeIdentity() {