Preprocessing pass to instantiate objects

[jakedves]

If the user doesn't wish to provide a host kernel they shouldn't have to. Scan through each kernel definition and collect information on what the user wishes to have. e.g.

scan the function annotated @tt.compute

it needs 2 generic circular buffers, 1 tailored circular buffer

scan the function annotated @tt.data_in

do the same, and @tt.data_out

check that these things work out and make sense

then add to list of dependencies.

do the same with other constructs that would be setup by host (DRAM, ...)

once global list of all dependencies is created, can generate host code (MLIR).