Merge pull request #64960 from ahoppen/ahoppen/5.9/fixit

[5.9] Adjustments for how Fix-It changes are represented by SwiftSyntax

Author: ahoppen

lib/ASTGen/Sources/ASTGen/Diagnostics.swift

@@ -110,7 +110,7 @@ func emitDiagnostic(
         message: fixIt.message.message,
         severity: .note,
         position: diagnostic.position,
-        fixItChanges: fixIt.changes.changes
+        fixItChanges: fixIt.changes
     )
   }
 
@@ -231,7 +231,7 @@ extension SourceManager {
           severity: .note,
           node: diagnostic.node,
           position: diagnostic.position,
-          fixItChanges: fixIt.changes.changes
+          fixItChanges: fixIt.changes
       )
     }