[Fix] Inbound check of sorter indices in searchsorted (#95109)
Fixes https://github.com/pytorch/pytorch/issues/91606, but in C++14 style.
Prior fix (https://github.com/pytorch/pytorch/pull/94863) was in C++17 which might violate some builds.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95109
Approved by: https://github.com/ngimel
