[llvm] [AArch64][SVE] Support lowering masked loads/stores of <4 x bf16> and <8 x bf16> (PR #208744)

[Shanzhi Chen via llvm-commits]

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chenshanzhi wrote:

I'd prefer to keep it consistent with the other test cases: v8bf16 only uses masked loads, while v4bf16 uses both fcmp and masked loads.

https://github.com/llvm/llvm-project/pull/208744