Add alpha support for 9.7 data processing intrinsics

[rockdreamer]

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name: Add alpha support for 9.7 data processing intrinsics
about: feature proposal.

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This change adds intrinsics for the following architectural features:

• FEAT_F16F32DOT
• FEAT_F16F32MM
• FEAT_F16MM
• FEAT_SVE_B16MM
• FEAT_SVE2p3
• FEAT_SME2p3

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