target/sh4: optimize gen_write_sr using extract op
This doesn't change the generated code on x86, but optimizes it on most RISC architectures and makes the code simpler to read. Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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