target-mips: fix for sign-issue in MULQ_W helper
Correct sign-propagation before multiplication in MULQ_W helper. The change also fixes previously incorrect expected values in the tests for MULQ_RS.W and MULQ_S.W. Signed-off-by: NPetar Jovanovic <petarj@mips.com> Richard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> (cherry picked from commit a345481b) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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