target-alpha: Clean up arithmetic traps.
Replace the EXCP_ARITH_OVERFLOW placeholder with the complete set of bits from the EXC_SUM IPR. Use them in the existing places where we raise arithmetic exceptions. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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