macOS

Combine rb_imemo_tmpbuf_auto_free_pointer and rb_imemo_tmpbuf_new #677

Job	Run time
make (test-all, --repeat-count=2, macos-14)	10m 36s
make (check, macos-14)	8m 0s
make (check, macos-14, --with-gcc=gcc-14)	9m 28s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	7m 43s
make (check, macos-15, capi)	8m 13s
make (test-bundler-parallel, macos-14)	22m 25s
make (check, macos-14, --with-gmp)	7m 2s
make (test-bundled-gems, macos-14)	9m 26s
make (check, macos-13)	14m 56s
macOS result	3s
	1h 37m 52s

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