add missing vector ctor reported by Markus Moll on the ML
add missing vector ctor reported by Markus Moll on the ML

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