tanh_should_not_have_numerical_bugs_on_macos is failing on MacOS

[antimora]

Describe the bug

failures:

---- kernel::unary::tests::tanh_should_not_have_numerical_bugs_on_macos stdout ----
thread 'kernel::unary::tests::tanh_should_not_have_numerical_bugs_on_macos' panicked at burn-wgpu/src/kernel/unary.rs:260:9:
assertion failed: !zero.is_nan() && zero == 1.0


failures:
    kernel::unary::tests::tanh_should_not_have_numerical_bugs_on_macos

test result: FAILED. 1238 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 14.63s

error: test failed, to rerun pass `-p burn-wgpu --lib`

To Reproduce
./run-checks all

Desktop (please complete the following information):

[burn]$ uname -a
Darwin MacBook-Pro-Max.attlocal.net 23.1.0 Darwin Kernel Version 23.1.0: Mon Oct  9 21:33:00 PDT 2023; root:xnu-10002.41.9~7/RELEASE_ARM64_T6031 arm64
[burn]$ 

[louisfd]

Fails for me too. It's due to @nathanielsimard 's refactoring (#1069) in which the "safe_tanh" alternative was removed

[nathanielsimard]

@louisfd We can reintroduce the "hack," but with the new codegen in place. I would have thought that the new Mac CI would have encountered the same error, but I suppose it might be specific to newer Macs.