[inductor] don't cache non-static content (#106502)
I happened to find that inductor may cache stale inner_fn_str and ReadWrites object in a ComputedBuffer when I work on looping ordering.
Let's say we have producer buffer buf0 and consumer buffer buf1. Before we call GraphLowering.finalize, the layout for buf0 may be a FlexibleLayout. At that moment, the inner_fn_str or ReadWrites object computed for buf1 will be based on the layout of buf0 which most likely is a contiguous FlexibleLayout. And they will be cached on buf1 object (or buf1.data).
However after we call GraphLowering.finalize, we may realize it's better to give a non-contiguous layout for buf0 (e.g., if its input has non-contiguous layout or whatever reason). The layout change of buf0 should affect the inner_fn_str and ReadWrites object for buf1. But we may have cached those on buf1. The stale ReadWrites objects for buf1 may result in sub-optimal strides for buf1.
This may affect perf and I'll check the nightly runs.
Here is a dump of `nodes` in `Scheduler.__init__` before the fix as a reference: https://gist.github.com/shunting314/ed2152a08e268f5563fd55398b1392c7
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106502
Approved by: https://github.com/jansel
