Unespected `abort` when running the espresso benchmark

[jvoisin]

As part of my effort to benchmark memory allocators in mimalloc-bench, I've stumbled upon the following abort in isoalloc when running the espresso bench:

$ LD_PRELOAD=/home/jvoisin/dev/mimalloc-bench/extern/iso/build/libisoalloc.so ./espresso ../../bench/espresso/largest.espresso
[ABORTING][373144](src/iso_alloc.c:1757 _iso_chunk_size()) Could not find any zone for allocation at 0x347ae209e000
Aborted

Is this working as intended? Every other memory allocator (even hardened ones) are handling this benchmark without crashing.

[struct]

Fixed in #58