tcg: Don't make exitreq flag a local temporary
The value is not actually live across basic blocks, so there's no need for the local property. This eliminates storing the temporary to its home location at the branch. Signed-off-by: NRichard Henderson <rth@twiddle.net> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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