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1e6c6c1576
For custom scalars, zero is not necessarily represented by a zeroed-out memory block (e.g. gnu MPFR). We therefore cannot rely on `memset` if we want to fill a matrix or tensor with zeroes. Instead, we should rely on `fill`, which for trivial types does end up getting converted to a `memset` under-the-hood (at least with gcc/clang). Requires adding a `fill(begin, end, v)` to `TensorDevice`. Replaced all potentially bad instances of memset with fill. Fixes #2245.