Delete dependsOn in swift-syntax

Author: meg-gupta

lib/ASTGen/Sources/ASTGen/Types.swift

@@ -356,8 +356,7 @@ extension ASTGenVisitor {
     var type = generate(type: node.baseType)
 
     // Handle specifiers.
-    if case .simpleTypeSpecifier(let simpleSpecifier) = node.specifiers.first {
-      let specifier = simpleSpecifier.specifier
+    if let specifier = node.specifier {
       if let kind = BridgedAttributedTypeSpecifier(from: specifier.keywordKind) {
         type =
           BridgedSpecifierTypeRepr.createParsed(