Most iOS embedder developers rely on two simulator builds:
* ios_debug_sim_unopt (for simulators on x64 hosts)
* ios_debug_sim_unopt_arm64 (for simulators on arm64 hosts)
We specify these two builds, for example, in our iOS unit test Xcode project `testing/ios/IosUnitTests/Tests/FlutterEngineConfig.xcconfig`.
Currently `local_engine.json` specifies two simulator builds:
* ios_debug_sim_unopt (for simulators on x64 hosts)
* ios_debug_sim_arm64 (for simulators on arm64 hosts)
While the x64 build specifies the `--unoptimized` flag, the arm64 build does not, which is problematic for those wanting to use both `et` and run the iOS unit tests.
This adds the `--unoptimized` flag for consistency with prevailing practice among iOS embedder developers.
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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