bitmap.h: Add explanation of sparse set as linked-list bitmap.
* bitmap.h: Add explanation of sparse set as linked-list bitmap.
* sbitmap.h: Add explanation about non-sparse sets as simple bitmap.
(TEST_BIT): Make a static inline function for stronger type checking.
(SET_BIT): Don't handle sbitmaps with popcount.
(RESET_BIT): Likewise.
(SET_BIT_WITH_POPCOUNT): New, like SET_BIT but with popcount.
(RESET_BIT_WITH_POPCOUNT): New, like RESET_BIT but with popcount.
* ebitmap.c (ebitmap_clear_bit): Use SET_BIT_WITH_POPCOUNT and
RESET_BIT_WITH_POPCOUNT on wordmask bitmaps.
(ebitmap_set_bit, ebitmap_and_into, ebitmap_and, ebitmap_ior_into,
ebitmap_and_compl_into, ebitmap_and_compl): Likewise.
* sparseset.h: Add explanation of sparse set representation.