only use memcpy realloc to shrink if an exact-sized free chunk exists
[musl] / src / malloc / oldmalloc /
drwxr-xr-x   ..
-rw-r--r-- 1285 aligned_alloc.c
-rw-r--r-- 12479 malloc.c
-rw-r--r-- 964 malloc_impl.h
-rw-r--r-- 206 malloc_usable_size.c