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

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

This patch deletes `vector.matrix_multiply` and `vector.flat_transpose`,
which are thin wrappers around the corresponding LLVM intrinsics:
  - `llvm.intr.matrix.multiply`
  - `llvm.intr.matrix.transpose`

These Vector dialect ops did not provide additional semantics or
abstraction beyond the LLVM intrinsics. Their removal simplifies the
lowering pipeline without losing any functionality.

The lowering chains:
- `vector.contract` → `vector.matrix_multiply` →
`llvm.intr.matrix.multiply`
- `vector.transpose` → `vector.flat_transpose` →
`llvm.intr.matrix.transpose`

are now replaced with:
  - `vector.contract` → `llvm.intr.matrix.multiply`
  - `vector.transpose` → `llvm.intr.matrix.transpose`

This was accomplished by directly replacing:
  - `vector::MatrixMultiplyOp` with `LLVM::MatrixMultiplyOp`
  - `vector::FlatTransposeOp` with `LLVM::MatrixTransposeOp`

Note: To avoid a build-time dependency from `Vector` to `LLVM`,
relevant transformations are moved from "Vector/Transforms" to
`Conversion/VectorToLLVM`.

These are identified by misc-include-cleaner.  I've filtered out those
that break builds.  Also, I'm staying away from llvm-config.h,
config.h, and Compiler.h, which likely cause platform- or
compiler-specific build failures.

The `vector.contract` op on two matrices A and B will be lowered to
individual dot products of each row and column of A and B respectively.
The existing lowering will extract each column of B for each row of A,
which leads to multiple values in the IR representing the same columns
of B.

This PR makes changes to the `ContractOpToDotLowering` to make sure that
the columns of B are only ever extracted once, so then the SSA values
representing the extracted columns are then re-used in the IR for later
dot products.

I have updated the existing vector-contract-to-dot-transforms test.

The `VectorTransformsOptions` on the `ConvertVectorToLLVMPass` is
currently represented as a struct, which makes it not serialisable. This
means a pass pipeline that contains this pass cannot be represented as
textual form, which breaks reproducer generation and options such as
`--dump-pass-pipeline`.

This PR expands the `VectorTransformsOptions` struct into the two
options that are actually used by the Pass' patterns:
`vector-contract-lowering` and `vector-transpose-lowering` . The other
options present in VectorTransformOptions are not used by any patterns
in this pass.

Additionally, I have changed some interfaces to only take these specific
options over the full options struct as, again, the vector contract and
transpose lowering patterns only need one of their respective options.

Finally, I have added a simple lit test that just prints the pass
pipeline using `--dump-pass-pipeline` to ensure the options on this pass
remain serialisable.

Fixes #129046

Disables `ContractionOpToMatmulOpLowering` for scalable vectors. This
pattern is meant to enable lowering to `llvm.matrix.multiply` - I'm not
aware of any use of that in the context of scalable vectors.

This patch is part of a project to move the Presburger library into
LLVM.

Adds a generic pattern rewrite for maskable Ops, `MaskableOpRewritePattern`,
that will work for both masked and un-masked cases, e.g. for both:

* `vector.mask {vector.contract}` (masked), and
* `vector.contract` (not masked).

This helps to reduce code-duplication and standardise how we implement such
patterns.

Fixes #78787

Fix obvious bug in AffineMap::replace for the case of zero result maps.
Extend/complete inferExprsFromList to work with empty expression lists.