vector.splat has been deprecated (user: please use the very similar vector.broadcast instead) 
with the last PR landing about 6 weeks ago.

The discourse discussion is at
https://discourse.llvm.org/t/rfc-mlir-vector-deprecate-then-remove-vector-splat/87143/1
The last PR was #152230

This PR completely removes vector.splat. In addition to removing vector.splat from VectorOps.td, it

- Updates the few remaining places where vector::SplatOp is created (now vector::BroadcastOp is created)
- Removes temporary patterns where vector.splat is replaced by vector.broadcast

The only place 'vector.splat' appears is now the files

https://github.com/llvm/llvm-project/blob/main/mlir/utils/tree-sitter-mlir/test/corpus/op.txt
 and

https://github.com/llvm/llvm-project/blob/main/mlir/utils/tree-sitter-mlir/dialect/vector.js

---------

Signed-off-by: James Newling <james.newling@gmail.com>

Use the `Base` type alias from
https://github.com/llvm/llvm-project/pull/158433.

## Details:
- Added missing compound assignment operators `|=`, `&=`, `^=` to
`mlir-tblgen`
- Replaced the arithmetic operators with added assignment operators for
`BitEnum` in the transformations
- Updated related documentation


## Tickets:
- Closes https://github.com/llvm/llvm-project/issues/158098

Use the `Base` type alias from https://github.com/llvm/llvm-project/pull/158433.

This patch updates the following ops to use `source` (instead of
`vector`) as the name for their source argument:
  * `vector.extract`
  * `vector.scalable.extract`
  * `vector.extract_strided_slice`

This change ensures naming consistency with the "builders" for these Ops
that already use the name `source` rather than `vector`. It also
addresses part of:
  * https://github.com/llvm/llvm-project/issues/131602

Specifically, it ensures that we use `source` and `dest` for read and
write operations, respectively (as opposed to `vector` and `dest`).

Signed-off-by: hanhanW <hanhan0912@gmail.com>

Propagates the alignment attribute from `vector.{load,store}` to
`spirv.{load,store}`.

---------

Co-authored-by: Jakub Kuderski <kubakuderski@gmail.com>

This PR removes `vector.extractelement` and `vector.insertelement` ops
from the code base in favor of the `vector.extract` and `vector.insert`
counterparts.

See RFC:
https://discourse.llvm.org/t/rfc-psa-remove-vector-extractelement-and-vector-insertelement-ops-in-favor-of-vector-extract-and-vector-insert-ops

See https://github.com/llvm/llvm-project/pull/147168 for more info.

This PR adds null check for `spirvVectorType` in VectorLoadOpConverter
to prevent a crash. Fixes #149956.