Extends the 'structured.fuse' op to accept packed handle containing
variable number of tile sizes.
Use of packed handles allows for runtime tiling decisions for improved
transform schedule flexibility and reusability.
The extension's design follows the existing approach of transform
'structured.tile_using_forall' op to more closely align their usage.
In case of tiling using nested loops, all created loops are packed into
a single return handle. For each target op, corresponding loops are
appended to the result handle.
Assisted-by: Claude
c10f33e893