[CFE] Allow crash test minimizer to work in more scenarios

This change allows to reproduce and minimize the bug in
https://dart-review.googlesource.com/c/sdk/+/385441/2 via this
(mouthful) of a command:

```
out/ReleaseX64/dart pkg/front_end/test/crashing_test_case_minimizer.dart --platform=out/ReleaseX64/vm_platform_strong.dill --invalidate=package:_fe_analyzer_shared/src/messages/codes.dart --invalidate=package:front_end/src/type_inference/assignable_errors.dart --initial-only-outline --load-from-component-before-invalidate --invalidate-all-at-once --packages=.dart_tool/package_config.json pkg/front_end/lib/src/type_inference/assignable_errors.dart
```

Which - after renames - creates a reproduction like this:

```
# Copyright (c) 2024, 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.

# Reproduce a crash.

type: newworld
worlds:
  - entry:
      - a.dart
    sources:
      a.dart: |
        import 'b.dart';
      b.dart: |
        export 'c.dart';
      c.dart: |
        class Message {}
        typedef SummaryTemplate = Message Function(int, int, num, num, num);
    expectedLibraryCount: 3

  - entry:
      - a.dart
    worldType: updated
    expectInitializeFromDill: false
    invalidate:
      - c.dart
      - a.dart
    expectedLibraryCount: 3
    advancedInvalidation: bodiesOnly
```

(this was already reproduced and fixed in
https://dart-review.googlesource.com/c/sdk/+/385720 but still)

Change-Id: I63d5510b1b848309cc4c74a15cdc1f33400d4861
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/385740
Reviewed-by: Johnni Winther <[email protected]>
Commit-Queue: Jens Johansen <[email protected]>

pkg/front_end/test/crashing_test_case_minimizer.dart

@@ -17,7 +17,7 @@ import 'crashing_test_case_minimizer_impl.dart';
 // parser on it and verifies that no syntax errors have been introduced.
 
 Future<void> main(List<String> arguments) async {
-  String? filename;
+  List<String> filenames = [];
   Uri? loadJson;
   for (String arg in arguments) {
     if (arg.startsWith("--json=")) {
@@ -41,8 +41,17 @@ Future<void> main(List<String> arguments) async {
         } else if (arg.startsWith("--platform=")) {
           String platform = arg.substring("--platform=".length);
           settings.platformUri = Uri.base.resolve(platform);
+        } else if (arg.startsWith("--packages=")) {
+          String packages = arg.substring("--packages=".length);
+          settings.packagesFileUri = Uri.base.resolve(packages);
         } else if (arg == "--no-platform") {
           settings.noPlatform = true;
+        } else if (arg == "--initial-only-outline") {
+          settings.initialOnlyOutline = true;
+        } else if (arg == "--load-from-component-before-invalidate") {
+          settings.loadFromComponentBeforeInvalidate = true;
+        } else if (arg == "--invalidate-all-at-once") {
+          settings.invalidateAllAtOnce = true;
         } else if (arg.startsWith("--invalidate=")) {
           for (String s in arg.substring("--invalidate=".length).split(",")) {
             settings.invalidate.add(Uri.base.resolve(s));
@@ -79,11 +88,8 @@ Future<void> main(List<String> arguments) async {
         } else {
           throw "Unknown option $arg";
         }
-      } else if (filename != null) {
-        throw "Already got '$filename', '$arg' is also a filename; "
-            "can only get one";
       } else {
-        filename = arg;
+        filenames.add(arg);
       }
     }
     if (settings.noPlatform) {
@@ -101,12 +107,14 @@ Future<void> main(List<String> arguments) async {
         throw "The platform file '${settings.platformUri}' doesn't exist";
       }
     }
-    if (filename == null) {
-      throw "Need file to operate on";
+    if (filenames.isEmpty) {
+      throw "Need file(s) to operate on";
+    }
+    for (String filename in filenames) {
+      File file = new File(filename);
+      if (!file.existsSync()) throw "File $filename doesn't exist.";
+      settings.entryUris.add(file.absolute.uri);
     }
-    File file = new File(filename);
-    if (!file.existsSync()) throw "File $filename doesn't exist.";
-    settings.mainUri = file.absolute.uri;
   }
 
   TestMinimizer testMinimizer = new TestMinimizer(settings);