Define MAPPED_FILE memory kind, and ensure inlining of get_object_memory_kind.
Minor tweaks to heap index: use 48 not 64 bits for alloc_site on x86-64, and get rid of 'self-contained' .c-file idea.
Don't save startup_brk unless requested at configure time.
Build libheap_index_fast_hooks.a by default.
Compile fix to heap_index_hooks.c, and define new __check_alloc_indexed function.