The change corrects sign-related issue with MULQ_S.PH. It also includes
extension to the already existing test which will trigger the issue.
Signed-off-by: NPetar Jovanovic <petarj@mips.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
(cherry picked from commit 9c19eb1e)
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>

Add MIPS ASE DSP testcases.
Signed-off-by: NJia Liu <proljc@gmail.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>