[fx2trt] Issue warnings instead of error if there's possible const folding opportunities (#71031)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71031
During the conversion stage, we might create some constants when size op is called and size is static. Raising error here causes problem for this case. Generally speaking it doesn't hurt to allow not const folding.
Test Plan:
Test with D33483843 on shufflenet.
Added unit tests.
Reviewed By: wushirong
Differential Revision: D33484183
fbshipit-source-id: 5b32c06297e56965befd7e83fe8ca273e3665cee
(cherry picked from commit e6b79bd3dd626f4b0035b9792a246fc09098d5ef)
