[mlir][TilingInterface] Add an option to tile and fuse to yield replacement for the...

[mlir][TilingInterface] Add an option to tile and fuse to yield replacement for the fused producer.

This patch adds an option to the method that fuses a producer with a
tiled consumer, to also yield from the tiled loops a value that can be
used to replace the original producer. This is only valid if it can be
assertained that the slice of the producer computed within each
iteration of the tiled loop nest does not compute slices of the
producer redundantly. The analysis to derive this is very involved. So
this is left to the caller to assertain.  A test is added that mimics
the `scf::tileConsumerAndFuseProducersGreedilyUsingSCFForOp`, but also
yields the values of all fused producers. This can be used as a
reference for how a caller could use this functionality.

Differential Revision: https://reviews.llvm.org/D141028