Reverts "[macOS] Generate universal gen_snapshots (#52885)" (#52913)

Reverts: flutter/engine#52885
Initiated by: cbracken
Reason for reverting: while this patch worked fine, it pushed the mac build bot over its time limit. Previous builds were just squeaking under the wire but seeing timeouts on the mac_host_engine host_release shard after this commit. e.g. https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20mac_host_engine/10667/overview

Looking at ci.yaml I see the timeout is set to 240, but the timeout on the failing shard is c
Original PR Author: cbracken

Reviewed By: {jmagman}

This change reverts the following previous change:
Previously, the `gen_snapshot_arm64` and `gen_snapshot_x64` binaries used by the tool were all built for x64 architecture. As such, developers building apps with Flutter rely on Rosetta translation with every build.

This refactors the gen_snapshot build rules on macOS hosts to consistently produce `gen_snapshot_arm64` and `gen_snapshot_x64` binaries with the target architecture of the build but with as universal binaries with both host architectures.

### arm64 host build

Prior to this patch we emitted:
* gen_snapshot_arm64 (arch: x64, target_arch: simarm64)

After this patch, we emit:
* artifacts_x64/gen_snapshot_arm64 (arch: x64, target_arch: simarm64)
* artifacts_arm64/gen_snapshot_arm64 (arch: arm64, target_arch: arm64)
* gen_snapshot_arm64 (universal binary composed of both of the above)

### x64 host build

Prior to this patch we emitted:
* gen_snapshot_x64 (arch: x64, target_arch: x64)

After this patch, we emit:
* artifacts_x64/gen_snapshot_x64 (arch: x64, target_arch: x64)
* artifacts_arm64/gen_snapshot_x64 (arch: arm64, target_arch: simx64)
* gen_snapshot_x64 (universal binary composed of both of the above)

Note that host builds on macOS currently default to a host architecture of x64 (can be overridden via `--force-mac-arm64`) regardless of host architecture and thus, the build itself relies on Rosetta translation when invoked on Apple Silicon arm64 hardware. This is to ensure a consistent build in CI regardless of bot architecture. See: https://github.com/flutter/engine/blob/6fa734d686888a39add026a2a98d6ec311c23efb/tools/gn#L502-L505

Issue: https://github.com/flutter/flutter/issues/101138
Issue: https://github.com/flutter/flutter/issues/69157

Related issue: https://github.com/flutter/flutter/issues/103386

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
4 files changed
tree: a3b916395e5adb6a35a2807546c7dab28d6bca77
  1. .github/
  2. assets/
  3. benchmarking/
  4. bin/
  5. build/
  6. build_overrides/
  7. ci/
  8. common/
  9. display_list/
  10. docs/
  11. examples/
  12. flow/
  13. flutter_frontend_server/
  14. flutter_vma/
  15. fml/
  16. impeller/
  17. lib/
  18. runtime/
  19. shell/
  20. skia/
  21. sky/
  22. testing/
  23. third_party/
  24. tools/
  25. vulkan/
  26. wasm/
  27. web_sdk/
  28. .ci.yaml
  29. .clang-format
  30. .clang-tidy
  31. .clangd
  32. .engine-release.version
  33. .gitattributes
  34. .gitignore
  35. .pylintrc
  36. .style.yapf
  37. analysis_options.yaml
  38. AUTHORS
  39. BUILD.gn
  40. CODEOWNERS
  41. CONTRIBUTING.md
  42. DEPS
  43. Doxyfile
  44. LICENSE
  45. README.md
README.md

Flutter Engine

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