Two small fixes for `__builtins_msvc` when targeting AArch64. - #23571

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just-harry:msvc-builtins-aarch64-fixes

Commits on Aug 10, 2026

Fix `__builtins_msvc.d`'s unittests failing to compile without `-dip1000` when targeting AArch64.
just-harry
committed
0ae5f69
Prevent LDC from emitting `'+prfchw' is not a recognized feature for this target (ignoring feature)` when targeting AArch64 in `__builtins_msvc.d`.
just-harry
committed
731e34e