Add a walk method to SyntaxRewriter

Author: ahoppen

CodeGeneration/Sources/generate-swiftsyntax/templates/swiftsyntax/SyntaxRewriterFile.swift

@@ -335,5 +335,17 @@ let syntaxRewriterFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
       }
       """
     )
+
+    DeclSyntax(
+      """
+      /// Rewrite `node` and anchor, making sure that the rewritten node also has
+      /// a parent if `node` had one.
+      public func rewrite(_ node: Syntax) -> Syntax {
+        let rewritten = self.visit(node)
+        let arena = SyntaxArena()
+        return Syntax(node.data.replacingSelf(rewritten.raw, arena: arena))
+      }
+      """
+    )
   }
 }

Sources/SwiftSyntax/generated/SyntaxRewriter.swift

@@ -6941,4 +6941,12 @@ open class SyntaxRewriter {
       return node
     }
   }
+  
+  /// Rewrite `node` and anchor, making sure that the rewritten node also has
+  /// a parent if `node` had one.
+  public func rewrite(_ node: Syntax) -> Syntax {
+    let rewritten = self.visit(node)
+    let arena = SyntaxArena()
+    return Syntax(node.data.replacingSelf(rewritten.raw, arena: arena))
+  }
 }