[clang] [CLANG][AArch64]Add Neon vectors for mfloat8_t (PR #99865)

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SpencerAbson wrote:

@kazutakahirata Please ping here if this persists after https://github.com/llvm/llvm-project/commit/3309061b2dd8a5cacacf05d956a872617808a974. Thanks



https://github.com/llvm/llvm-project/pull/99865