Fix warning: implicit conversion loses integer precision in SparseMatrix. No need to use std::ptrdiff_t instead of Index since this later is requested to be signed.
Fix warning: implicit conversion loses integer precision in SparseMatrix. No need to use std::ptrdiff_t instead of Index since this later is requested to be signed.

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