* alloc.c: Remove unportable assumptions about struct layout.
(SDATA_SELECTOR, SDATA_DATA_OFFSET): New macros. (SDATA_OF_STRING, SDATA_SIZE, allocate_string_data): (allocate_vectorlike, make_pure_vector): Use the new macros, plus offsetof, to remove unportable assumptions about struct layout. These assumptions hold on all porting targets that I know of, but they are not guaranteed, they're easy to remove, and removing them makes further changes easier.
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