Compile Error on nightly, platform_intrinsics - feature has been removed

[MikMikus]

on main branch for 1.78.0-nightly (c475e2303 2024-02-28)

error[E0557]: feature has been removed
  --> /home/REDACTED/.cargo/git/checkouts/pathfinder-f0bd20e7aa700f92/cb4eb59/simd/src/lib.rs:11:61
   |
   | ...intrinsics, platform_intrinsics))]
   |                ^^^^^^^^^^^^^^^^^^^ feature has been removed
   |
   = note: SIMD intrinsics use the regular intrinsics ABI now

For more information about this error, try `rustc --explain E0557`.

related to: #550 and #548

[Samson]

I think extern "platform-intrinsic" block needs to be replaced with core_intrinsics feature and use std::intrinsics::simd::*;, I will start working on it tomorrow using https://github.com/model-checking/kani/pull/3052/files as reference.