Add AsyncSyntaxRewriter

Author: roopekv

CodeGeneration/Sources/generate-swift-syntax/GenerateSwiftSyntax.swift

@@ -129,6 +129,15 @@ struct GenerateSwiftSyntax: AsyncParsableCommand {
       GeneratedFileSpec(swiftSyntaxGeneratedDir + ["SyntaxEnum.swift"], syntaxEnumFile),
       GeneratedFileSpec(swiftSyntaxGeneratedDir + ["SyntaxKind.swift"], syntaxKindFile),
       GeneratedFileSpec(swiftSyntaxGeneratedDir + ["SyntaxRewriter.swift"], syntaxRewriterFile),
+      GeneratedFileSpec(
+        swiftSyntaxGeneratedDir + ["AsyncSyntaxRewriter.swift"],
+        makeSyntaxRewriterFile(
+          className: "AsyncSyntaxRewriter",
+          functionEffectSpecifiers: "async",
+          functionCallOperators: "await",
+          spiName: "MacroExpansion"
+        )
+      ),
       GeneratedFileSpec(swiftSyntaxGeneratedDir + ["SyntaxTraits.swift"], syntaxTraitsFile),
       GeneratedFileSpec(
         swiftSyntaxGeneratedDir + ["SyntaxVisitor.swift"],

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/SwiftSyntaxDoccIndexTemplate.md

@@ -48,6 +48,7 @@ allows Swift tools to parse, inspect, generate, and transform Swift source code.
 - <doc:SwiftSyntax/SyntaxVisitor>
 - <doc:SwiftSyntax/SyntaxAnyVisitor>
 - <doc:SwiftSyntax/SyntaxRewriter>
+- <doc:SwiftSyntax/AsyncSyntaxRewriter>
 - <doc:SwiftSyntax/SyntaxTreeViewMode>
 - <doc:SwiftSyntax/SyntaxVisitorContinueKind>
 - <doc:SwiftSyntax/ReversedTokenSequence>