Fix radamsa binary for ARM64 - #5463
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When executing macOS ARM64 Swarming tasks, ClusterFuzz invokes the radamsa mutator binary. Previously, only an x86_64 macOS binary was bundled, and extracted files could lack execute permissions under Swarming bot users. Changes: * Add native macOS ARM64 binary (`bin/mac/radamsa_arm64`). * Update `get_radamsa_path()` in `engine_common.py`: - Prefer `radamsa` from `APP_DIR` (fuzzer build directory) if present. - Detect ARM64 on macOS and select `radamsa_arm64` over x86_64 `radamsa`. - Ensure `0o755` permissions on the resolved binary via `os.chmod`. * Add unit tests for `get_radamsa_path()` in `engine_common_test.py`. Bug: 561690132 Signed-off-by: Manuel Briones <manuelbriones@google.com>
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When executing Mac ARM64 swarming tasks we execute radamsa binary,
hence having it as a ARM64 is needed.
python butler.py py_unittest -t core -p engine_common_test.py(passed).Bug: 561690132