[AArch64][SME] Disable inlining of callees with new ZT0 state (#121338)

Inlining must be disabled for new-ZT0 callees as the callee is required
to save ZT0 and toggle PSTATE.ZA on entry.

[test] Move CodeGen/aarch64-* into the AArch64 subfolder

Similar to other targets (AMDGPU, Mips, PowerPC, RISCV, X86, ...)

`ninja check-clang-codegen-aarch64` can be used to test this subfolder.

P

[test] Move CodeGen/aarch64-* into the AArch64 subfolder

Similar to other targets (AMDGPU, Mips, PowerPC, RISCV, X86, ...)

`ninja check-clang-codegen-aarch64` can be used to test this subfolder.

Pull Request: https://github.com/llvm/llvm-project/pull/115818

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