atom::tests::repr fails on armv7hl and s390x

[ignatenkobrain]

armv7hl

---- atom::tests::repr stdout ----
thread 'atom::tests::repr' panicked at 'assertion failed: `(left == right)`
  left: `0`,
 right: `8`', src/atom.rs:802:9
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
failures:
    atom::tests::repr

s390x

---- atom::tests::repr stdout ----
thread 'atom::tests::repr' panicked at 'assertion failed: 0x6500000000000011 != 0x0000000000006511', src/atom.rs:777:13
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
failures:
    atom::tests::repr

s390x is Big-Endian