[regexp] Experimental support for regexp named captures

src/regexp/regexp-ast.h

Index: src/regexp/regexp-ast.h
diff --git a/src/regexp/regexp-ast.h b/src/regexp/regexp-ast.h
index 39c9ceea4ea275c879205b1b24884a2f1fccd43c..97d6870e211b6c359c39a0614c25c17729c8178d 100644
--- a/src/regexp/regexp-ast.h
+++ b/src/regexp/regexp-ast.h
@@ -427,12 +427,15 @@ class RegExpCapture final : public RegExpTree {
   RegExpTree* body() { return body_; }
   void set_body(RegExpTree* body) { body_ = body; }
   int index() { return index_; }
+  Vector<const uc16> name() const { return name_; }
+  void set_name(Vector<const uc16> name) { name_ = name; }
   static int StartRegister(int index) { return index * 2; }
   static int EndRegister(int index) { return index * 2 + 1; }
 
  private:
   RegExpTree* body_;
   int index_;
+  Vector<const uc16> name_;
 };
 
 
@@ -489,6 +492,7 @@ class RegExpLookaround final : public RegExpTree {
 
 class RegExpBackReference final : public RegExpTree {
  public:
+  RegExpBackReference() : capture_(nullptr) {}
   explicit RegExpBackReference(RegExpCapture* capture) : capture_(capture) {}
   void* Accept(RegExpVisitor* visitor, void* data) override;
   RegExpNode* ToNode(RegExpCompiler* compiler, RegExpNode* on_success) override;
@@ -500,9 +504,13 @@ class RegExpBackReference final : public RegExpTree {
   int max_match() override { return kInfinity; }
   int index() { return capture_->index(); }
   RegExpCapture* capture() { return capture_; }
+  void set_capture(RegExpCapture* capture) { capture_ = capture; }
+  Vector<const uc16> name() const { return name_; }
+  void set_name(Vector<const uc16> name) { name_ = name; }
 
  private:
   RegExpCapture* capture_;
+  Vector<const uc16> name_;
 };