[clang] [llvm] [AArch64] Implement FP8 SVE Intrinsics for narrowing conversions (PR #118124)

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+// REQUIRES: aarch64-registered-target
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+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -verify -emit-llvm %s
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CarolineConcatto wrote:

I think @SpencerAbson  asked on the previous PR,  but just in case why are we adding  -target-feature +bf16 only for the Sema tests? So this will be probably fixed in the previous patch

https://github.com/llvm/llvm-project/pull/118124