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Use __arm_streaming attribute for SME functions

Mark Horvath requested to merge sme2-version-of-add into main

As the library avoids branching as much as possible there is no reason to share functions in the binary between the SVE2 and SME/SME2 paths. That kind of sharing is made possible by the __arm_streaming_compatible attribute. In addition, functions using SME2 instructions must be attributed with the __arm_streaming (or __arm_locally_streaming) keyword.

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