This adds support for lowering vector.broadcast ops to SME, if the
source is either a scalar, 0-d vector, or 1-d vector, and the result a
2-d scalable vector that aligns with SME tiles.
This follows on from D157005 which introduced a vector to tile slice op
that moves a 1-d scalable vector to a slice of a 2-d scalable vector
(tile). The lowering from vector.broadcast is similar, a couple of
helper functions are added to prevent duplication.
Lowering of vector.broadcast contributes towards a path from linalg.fill
to SME.
Depends on D157005
Reviewed By: awarzynski, dcaballe
Differential Revision: https://reviews.llvm.org/D158586
2dd3f42083