MallocSizeOf panics on Android

[tomaka]

We reach this line when trying to run Substrate on Android:

parity-common/parity-util-mem/src/allocators.rs

Line 109 in 46d8f6b

unreachable!("estimate heapsize or feature allocator needed")

[ordian]

does substrate use jemalloc-global feature of parity-util-mem?

[tomaka]

Substrate doesn't use jemalloc (and we don't want to force that on users), so I don't think that'd be appropriate.

[ordian]

cc @cheme

parity-common/parity-util-mem/src/allocators.rs

Line 99 in 46d8f6b

} else if #[cfg(target_os = "linux")] {

maybe we should extend that to android as well

[ordian]

@tomaka could you test #355?

[cheme]

@ordian , #355 seems sensible, but I cannot really test, last resort should be to use jemalloc or very last resort estimate_size.