host-utils: add clrsb32/64 - count leading redundant sign bits
this patch introduces wrappers for the clrsb builtins, which count the leading redundant sign bits. Signed-off-by: NClaudio Fontana <claudio.fontana@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NRichard Henderson <rth@twiddle.net>
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