Alex Crichton
93d2003c9a
This primarily pulls in alexcrichton/dlmalloc-rs/55 and alexcrichton/dlmalloc-rs/54 to address 144199. Notably the highest byte in the wasm address space is no longer allocatable and additionally the allocator internally uses `wrapping_add` instead of `add` on pointers since on 32-bit platforms offsets might be larger than half the address space.
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