[aoti] Fix compilation bug for buffer mutations (#121688)
I realized there's a bug when unlifting buffer mutations in AOTI.
However there seems to be a bug during tracing where AOTI mutates the buffer. I didn't take the time to investigate, so I left is as TODO for now.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121688
Approved by: https://github.com/chenyang78
