Revert of [debugger] remove debugger statement support from FCG/CS.

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index c2d9cc4c78ed616a3eb95f6506186ee01005ba86..e5c7646ef3a342794ad5db1ded50b13ecd425e73 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -1146,10 +1146,26 @@
 
 
 class DebuggerStatement final : public Statement {
- private:
-  friend class AstNodeFactory;
-
-  explicit DebuggerStatement(int pos) : Statement(pos, kDebuggerStatement) {}
+ public:
+  void set_base_id(int id) { base_id_ = id; }
+  static int num_ids() { return parent_num_ids() + 1; }
+  BailoutId DebugBreakId() const { return BailoutId(local_id(0)); }
+
+ private:
+  friend class AstNodeFactory;
+
+  explicit DebuggerStatement(int pos)
+      : Statement(pos, kDebuggerStatement),
+        base_id_(BailoutId::None().ToInt()) {}
+
+  static int parent_num_ids() { return 0; }
+  int base_id() const {
+    DCHECK(!BailoutId(base_id_).IsNone());
+    return base_id_;
+  }
+  int local_id(int n) const { return base_id() + parent_num_ids() + n; }
+
+  int base_id_;
 };