target/s390x: Clean up TB flag bits
Most of the PSW bits that were being copied into TB->flags are not relevant to translation. Removing those that are unnecessary reduces the amount of translation required. Reviewed-by: NAurelien Jarno <aurelien@aurel32.net> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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