macOS

apply ctx-switching patch #711

Job	Run time
make (test-bundler-parallel, macos-14)	20m 16s
make (test-all, --repeat-count=2, macos-14)	10m 41s
make (check, macos-15)	6m 33s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	8m 22s
make (check, macos-14, --with-gcc=gcc-14)	12m 56s
make (check, macos-14)	8m 2s
make (test-bundled-gems, macos-14)	11m 30s
make (check, macos-14, --with-gmp)	7m 33s
macOS result	3s
	1h 25m 56s

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