[clang] [llvm] [AArch64] Add updated FEAT_SVE_B16B16 and begin replacement of 'b16b16' flag (PR #101480)

[via llvm-commits]

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+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +sve2 -verify -verify-ignore-unexpected=error,note -emit-llvm -o - %s
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SpencerAbson wrote:

Will do :+1: 

https://github.com/llvm/llvm-project/pull/101480