BUG: skip legacy dtype multithreaded test on 32 bit runners #28424
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Backport of #28421.
Fixes #28412.
For reasons I don't fully understand,
test_legacy_usertype_cast_init_thread_safetysometimes crashes 32 bit CI runners due to OOM errors. This test spawns a lot of threads but other tests spawn more. The crashes happen when Python exhausts the 4 GB of address space available to the runner, so I think it might depend on factors like the precise memory allocation pattern of the test as well as maybe memory fragmentation in the memory space available to the runner.Rather than trying to track this down more, I just skip the test on 32 bit runners. This crash has only ever been observed there.
While I was at it I did a cleanup (most of the diff) to replace one-off uses of
np.dtype(np.intp).itemsize == 8with a newIS_64BITconstant.