macOS

[REFERENCE] Backport thread scheduling #733

Job	Run time
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	6m 7s
make (check, macos-14)	7m 6s
make (test-bundler-parallel, macos-14)	16m 13s
make (test-bundled-gems, macos-14)	9m 36s
make (test-all, --repeat-count=2, macos-14)	8m 8s
make (check, macos-14, --with-gmp)	6m 5s
make (check, macos-14, --with-gcc=gcc-14)	7m 35s
make (check, macos-15)	6m 49s
macOS result	4s
	1h 7m 43s

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