Split distribute-cores-and-objectfifos pass in 2

[newling]

I know @Abhishek-Varma proposed a more dramatic version of this PR previously #452 but I think that the place I'm choosing to split this pass in 2 in reasonable -- basically I'm just separating out the logic which assigns tiles to logicalobjectfifos from everything else i.e. the only thing that changes in the second pass is

 %0 = amdaie.logicalobjectfifo.from_memref %alloc, {} : ... 

becomes

 %0 = amdaie.logicalobjectfifo.from_memref %alloc, {%tile} : ... 

The code copied between .cpp files is completely unmodified, a 100% cut-paste.

I'd like to improve the tests in a second PR.

I will polish this (add comments for the TODOs) if the proposal seems ok.

[yzhang93]

I think @jtuyls was also working on tile assignments as a separate pass and already had a draft. We need something more sophisticated when assigning multiple memTiles and shimTiles.

[jtuyls]

I think @jtuyls was also working on tile assignments as a separate pass and already had a draft. We need something more sophisticated when assigning multiple memTiles and shimTiles.

Yes, I will be putting up a PR later today which has this, but with a bunch of changes in the tile assignment for 4x4.

[newling]

Ok, will close this and take a look at #915