New commits:

- ibuf: change ibuf_consume_before argument type to const void ptr
- ibuf: introduce ibuf_consume/ibuf_consume_before API
- matras: fix matras_view::block_count overflow
- slab: fix uint32_t overflow in slab_capacity
- debug: add assertions of ASAN version to non ASAN
- ibuf: add ibuf_discard
- slab: fix NULL ptr deref in assertion in slab_get

NO_TEST=submodule bump
NO_CHANGELOG=submodule bump
NO_DOC=submodule bump