Guarantee symbol allocation for all sizes/strides/storage offset (#89879)
We may need to express guards on the size/stride/storage offset of
a tensor, but we cannot do this if it's already been duck sized.
This PR guarantees that we allocate a symbol (or negation of the
symbol) whenever we ask to create a SymInt, and propagates this
symbol to SymNode so that Dynamo can look at it (not in this PR).
This PR doesn't actually add guards, nor does Dynamo do anything
with these symbols.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89879
Approved by: https://github.com/albanD
