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You wouldn't need the IOR if we make the parameter visited_blocks, and if it's null allocate the thing. That should work since TM regions do not overlap. Although perhaps that makes the interface a bit confusing...
BITMAP_ALLOC (&tm_obstack).bitmap_obstack_initialize (&tm_obstack); + bb_in_TM_region = BITMAP_ALLOC (NULL);
and then you don't need the free at the end, since we junk the entire obstack all at once.
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