fixed preserve_mask definition for AltiVec (needed __vector keyword)
fixed preserve_mask definition for AltiVec (needed __vector keyword)

TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,pthulhu/eigen,Zefz/eigen,TSC21/Eigen,pthulhu/eigen,pasuka/eigen,ritsu1228/eigen,ritsu1228/eigen,pasuka/eigen,toastedcrumpets/eigen,cjntaylor/eigen,ROCmSoftwarePlatform/hipeigen,pthulhu/eigen,ritsu1228/eigen,pasuka/eigen,toastedcrumpets/eigen,toastedcrumpets/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen,TSC21/Eigen,Zefz/eigen,Zefz/eigen,pthulhu/eigen,pasuka/eigen,pthulhu/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,toastedcrumpets/eigen,cjntaylor/eigen,ritsu1228/eigen,Zefz/eigen,cjntaylor/eigen,cjntaylor/eigen