Few tests fail with OOM on 32bit

[ignatenkobrain]

failures:
---- enc::test::test_roundtrip_compressed_repeated stdout ----
thread 'enc::test::test_roundtrip_compressed_repeated' panicked at 'OOM', /usr/share/cargo/registry/alloc-no-stdlib-2.0.1/src/stack_allocator.rs:52:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
---- enc::test::test_roundtrip_ukkonooa stdout ----
thread 'enc::test::test_roundtrip_ukkonooa' panicked at 'OOM', /usr/share/cargo/registry/alloc-no-stdlib-2.0.1/src/stack_allocator.rs:52:13
failures:
    enc::test::test_roundtrip_compressed_repeated
    enc::test::test_roundtrip_ukkonooa

[ignatenkobrain]

I see taht on armv7hl there are more tests which OOM:

failures:
---- enc::test::test_roundtrip_monkey stdout ----
thread 'enc::test::test_roundtrip_monkey' panicked at 'OOM', /usr/share/cargo/registry/alloc-no-stdlib-2.0.1/src/stack_allocator.rs:52:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
---- enc::test::test_roundtrip_quickfox stdout ----
thread 'enc::test::test_roundtrip_quickfox' panicked at 'OOM', /usr/share/cargo/registry/alloc-no-stdlib-2.0.1/src/stack_allocator.rs:52:13
---- enc::test::test_roundtrip_quickfox_repeated stdout ----
thread 'enc::test::test_roundtrip_quickfox_repeated' panicked at 'OOM', /usr/share/cargo/registry/alloc-no-stdlib-2.0.1/src/stack_allocator.rs:52:13
failures:
    enc::test::test_roundtrip_monkey
    enc::test::test_roundtrip_quickfox
    enc::test::test_roundtrip_quickfox_repeated

[danielrh]

Interesting--all these tests allocate the working-set data on the stack.
Is it possible to make them to skip on arm? I doubt you'd choose a stack allocator on Arm, but it was a nice cross platform way to test the nostd 3rd party allocators.

[alexanderkjall]

These test errors also affects the debian builds: https://ci.debian.net/data/autopkgtest/testing/armel/r/rust-brotli/38555788/log.gz