Use core::arch::wasm functions rather than intrinsics
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These wasm functions are available in `core::arch::wasm32` since [1], so we can use them while avoiding the possibly-recursive `intrinsics::*` calls (in practice none of those should always lower to libcalls on wasm, but that is up to LLVM). Since these require an unstable feature, they are still gated under `unstable-intrinsics`. [1]: rust-lang/stdarch#1677
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This was referenced Jan 11, 2025
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These wasm functions are available in
core::arch::wasm32since 1, so we can use them while avoiding the possibly-recursiveintrinsics::*calls (in practice none of those should always lower to libcalls on wasm, but that is up to LLVM).Since these require an unstable feature, they are still gated under
unstable-intrinsics.