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b8ff0f4901
This PR does a few things. Mainly it makes the builds in mac_host_engine.json each build fewer targets to increase parallelism for post-submit and release builds. To ensure that increasing parallelism doesn't lead to capacity issues, this change also allows the mac_host_engine.json builds to run on either intel or arm64 macOS hosts. Finally, when building on an arm64 macOS host to target macOS, this PR changes the `gn` script to ensure that the arm64 native clang toolchain will be used. To keep mac_host_engine.json focused on builds that produce artifacts, this PR also moves tests from that file into the ill-named mac_unopt.json. In a subsequent PR, I'll rename all the *_unopt.json files to *_tests.json or something similar. The artifacts produced by these builds are passing framework presubmit checks in https://github.com/flutter/flutter/pull/152345.