nir/nir_opt_offsets: Prevent offsets going above max
In try_fold_load_store when trying to extract const addition from non-const offset source, we should take into account that there is already a constant base offset, which should count towards the limit.
The issue was found in "Monster Hunter: World" running on Turnip.
Fixes: cac6f633 ("nir/opt_offsets: Use nir_ssa_scalar to chase offset additions.")
Well, the issue was present before this commit but it made a lot of changes in surrounding code.
It seems only Turnip has non-~0
limit for shared_max
, so only Turnip was affected by this issue in the wild.