Hard code known true contiguity settings for unbacked SymInts (#95003)
Extracted from https://github.com/pytorch/pytorch/pull/94523 which has E2E test
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95003
Approved by: https://github.com/voznesenskym, https://github.com/ngimel
