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[AArch64][SME2] Add rudimentary LLVM support for aarch64_svcount.
Needs ReviewPublic

Authored by sdesmalen on Oct 27 2022, 10:01 AM.

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Summary

The aarch64_svcount opaque type is a scalable type. This patch adds AArch64
CodeGen support such that the type can be passed and returned to/from
functions, and also adds support to use this type in load/store operations
and PHI nodes.

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