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Previously we would use the `.int` assembler directive to generate 32-bit words in the note section. However, `.int` is note guaranteed to produce 4-bytes; in fact, on some platforms (e.g. AArch64) it produces 8-bytes. Use the `.4bytes` directive to avoid this. Moreover, we used the `.align` directive, which is quite platform dependent. On AArch64 it appears to not even be idempotent (despite what the documentation claims). `.balign` is consequentially preferred as it offers consistent behavior across platforms.
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