Fix read of uninitialized variable

Currently many places in the codebase create AST_Jump objects but do not initalice the line ,col numbers. Set them to -1, in order to not call SetCurrentDebugLocation with random locations.

src/core/ast.h

@@ -808,7 +808,10 @@ public:
     virtual void accept(ASTVisitor* v);
     virtual void accept_stmt(StmtVisitor* v);
 
-    AST_Jump() : AST_stmt(AST_TYPE::Jump) {}
+    AST_Jump() : AST_stmt(AST_TYPE::Jump) {
+        lineno = -1;
+        col_offset = -1;
+    }
 
     static const AST_TYPE::AST_TYPE TYPE = AST_TYPE::Jump;
 };