[mlir][vector] Fix distribution of scf.for with value coming from above

[mlir][vector] Fix distribution of scf.for with value coming from above

When a value used in the forOp is defined outside the region but within
the parent warpOp we need to return and distribute the value to pass it
to new operations created within the loop.
Also simplify the lambda interface.

Differential Revision: https://reviews.llvm.org/D137146