Details:
- Removed malloc_ft and free_ft function pointer arguments from the
interface to bli_apool_init() after deciding that there is no need to
specify the malloc()/free() for blocks within the apool. (The apool
blocks are actually just array_t structs.) Instead, we simply call
bli_malloc_intl()/_free_intl() directly. This has the added benefit
of allowing additional output when memory tracing is enabled via
--enable-mem-tracing. Also made corresponding changes elsewhere in
the apool API.
- Changed the inner pools (elements of the array_t within the apool_t)
to use BLIS_MALLOC_POOL and BLIS_FREE_POOL instead of BLIS_MALLOC_INTL
and BLIS_FREE_INTL.
- Disabled definitions of bli_malloc_pool() and bli_free_pool() since
there are no longer any consumers of these functions.
- Very minor comment / printf() updates.
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