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Re-use an existing stack variable (reducing stack footprint, which also results in smaller code due to some stack accesses no longer needing a 32-bit displacement), at once using a union instead of casts. Also switch to rex_prefix based conditionals instead of op_bytes ones. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>