macOS

Put parallel sweep impl behind --enable-parallel-sweep configure option #10494

Job	Run time
make (check, macos-15)	4m 33s
make (check, macos-14, --with-gcc=gcc-14)	6m 33s
make (test-bundler-parallel, macos-14)	23m 2s
make (test-bundled-gems, macos-14)	8m 33s
make (test-all, --repeat-count=2, macos-14)	11m 5s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	4m 24s
make (check, macos-14, --with-gmp)	4m 23s
make (check, macos-14)	4m 23s
macOS result	5s
	1h 7m 1s

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