[AArch64] Improve bcvtn2 and remove aarch64_neon_bfcvt intrinsics (#120363) This started out as trying to combine bf16 fpround to BFCVT2 instructions, but ended up removing the aarch64.neon.nfcvt intrinsics in favour of generating fpround instructions directly. This simplifies the patterns and can lead to other optimizations. The BFCVT2 instruction is adjusted to makes sure the types are valid, and a bfcvt2 is now generated in more place. The old intrinsics are auto-upgraded to fptrunc instructions too.
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