macOS

Singleton classes of unshareable objects are not shareable #9976

Job	Run time
make (test-bundler-parallel, macos-14)	19m 46s
make (check, macos-15)	3m 42s
make (check, macos-14)	3m 22s
make (check, macos-14, --with-gmp)	4m 36s
make (test-bundled-gems, macos-14)	11m 34s
make (check, macos-14, --with-gcc=gcc-14)	6m 42s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	4m 58s
make (test-all, --repeat-count=2, macos-14)	5m 34s
macOS result	3s
	1h 0m 17s

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