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When the compiler defines __ARM_BUILDATTR64_FV, emit AArch64 feature-and-bits build attributes for BTI, PAC, and GCS from sysdep.h instead of a GNU property note. Keep the GNU property note as the fallback for older toolchains. Mirror the same marking logic in elf/tst-asm-helper.h so custom test DSOs and assembly tests that cannot include sysdep.h get consistent feature marking. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>