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4fd37c7198
This check was added unconditionally in c51b229140 ("Disable f16 on
Aarch64 without `neon`") and reverted in 4a8d35709e ("Revert "Disable
`f16` on Aarch64 without `neon`"") since it did not fail in Rust's
build. However, it is still possible to hit this crash if using LLVM 19
built with assertions, so disable the type conditionally based on
version here.
Note that for these builds, a similar patch is needed in the build
script for `compiler-builtins` since it does not yet use
`cfg(target_has_reliable_f16)` (hopefully to be resolved in the near
future).
Report: https://www.github.com/rust-lang/rust/pull/139276#issuecomment-3014781652
Original LLVM issue: https://www.github.com/llvm/llvm-project/issues/129394