gen_snapshot no longer writing all files for iOS #6436
Description
Exits cleanly, but doesn't actually write out:
--vm_isolate_snapshot=build/aot/snapshot_aot_vmisolate
@johnmccutchan @a-siva @chinmaygarde
% /src/flutter/bin/cache/artifacts/engine/ios-release/gen_snapshot --vm_isolate_snapshot=build/aot/snapshot_aot_vmisolate --isolate_snapshot=build/aot/snapshot_aot_isolate --packages=.packages --url_mapping=dart:mojo.internal,/Users/eseidel/.pub-cache/hosted/pub.dartlang.org/mojo-0.4.27/sdk_ext/internal.dart --url_mapping=dart:ui,/src/flutter/bin/cache/pkg/sky_engine/dart_ui/ui.dart --url_mapping=dart:jni,/src/flutter/bin/cache/pkg/sky_engine/dart_jni/jni.dart --url_mapping=dart:vmservice_sky,/src/flutter/bin/cache/pkg/sky_engine/sdk_ext/vmservice_io.dart --embedder_entry_points_manifest=/src/flutter/bin/cache/artifacts/engine/ios-release/dart_vm_entry_points.txt --embedder_entry_points_manifest=/src/flutter/bin/cache/artifacts/engine/ios-release/dart_io_entries.txt --assembly=build/aot/snapshot_assembly.S /src/flutter/examples/flutter_gallery/lib/main.dart
VMIsolate(CodeSize): 103277
Isolate(CodeSize): 1880421
ReadOnlyData(CodeSize): 2141944
Instructions(CodeSize): 5789376
Total(CodeSize): 9915018
% echo $? [/src/flutter/examples/flutter_gallery]
0
% find . | grep vmisolate