Fix bug in writing deps file (Fixes #30156)

tools/patch_sdk.dart

 #!/usr/bin/env dart
 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Command line tool to merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 
 import 'dart:io';
 import 'dart:isolate' show RawReceivePort;
@@ skipping 174 matching lines @@
   var sdkDir = outDirUri;
   if (forDart2js || forFlutter) {
     // Note: this would fail if `../patched_sdk/platform.dill` doesn't exist. We
     // added an explicit dependency in the .GN rules so patched_dart2js_sdk (and
     // patched_flutter_sdk) depend on patched_sdk to ensure that it exists.
     platformForDeps = outDirUri.resolve('../patched_sdk/platform.dill');
     sdkDir = outDirUri.resolve('../patched_sdk/');
   }
   deps.addAll(await fasta.getDependencies(Platform.script,
       sdk: sdkDir, packages: packages, platform: platformForDeps));
-  await writeDepsFile(Uri.base.resolveUri(new Uri.file("$outDir.d")),
-      platformFinalLocation, deps);
+  await writeDepsFile(platformFinalLocation,
+      Uri.base.resolveUri(new Uri.file("$outDir.d")), deps);
   await new File.fromUri(platform).rename(platformFinalLocation.toFilePath());
 }
 
 /// Generates an outline.dill and platform.dill file containing the result of
 /// compiling a platform's SDK.
 ///
 /// Returns a list of dependencies read by the compiler. This list can be used
 /// to create GN dependency files.
 Future<List<Uri>> compilePlatform(Uri patchedSdk, Target target, Uri packages,
     Uri fullOutput, Uri outlineOutput) async {
@@ skipping 534 matching lines @@
     if (diff != 0) return diff;
     return end - other.end;
   }
 }
 
 List<SdkLibrary> _getSdkLibraries(String contents) {
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(forDart2js);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }