Andriod x64 broken

[Xudong-Huang]

......
running 3 tests
test reg_context::test::test_swap_context ... ok
test rt::test::test_is_context ... ok
error: test failed, to rerun pass `--lib`

Caused by:
  process didn't exit successfully: `/android-runner x86_64 /target/x86_64-linux-android/debug/deps/generator-5584d034cdf72405` (signal: 11, SIGSEGV: invalid memory reference)
test rt::test::test_overflow ... 
Error: Process completed with exit code 101.

this use the unix config, but other unix target could pass