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Using a variable that is declared "const" for this tells the compiler that it may read the value once and assume that it does not change across function calls. For target_page_size, this means we have only one assert per function, and one read of the variable. This reduces the size of qemu-system-aarch64 by 8k. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>