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This introduces the Armv9.5-A architecture version to the Arm backend, following on from the existing implementation for AArch64 targets. Mode details about the Armv9.5-A architecture version can be found at: * https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/arm-a-profile-architecture-developments-2023 * https://developer.arm.com/documentation/ddi0602/2023-09/