tcg: Improve tcg_gen_muli_i32/i64
Convert multiplication by power of two to left shift. Reviewed-by: NEmilio G. Cota <cota@braap.org> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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