[mlir][LLVM] Delete `getVectorElementType` (#134981)

The LLVM dialect no longer has its own vector types. It uses
`mlir::VectorType` everywhere. Remove `LLVM::getVectorElementType` and
use `cast<VectorType>(ty).getElementType()` instead. This commit
addresses a
[comment](https://github.com/llvm/llvm-project/pull/133286#discussion_r2022192500)
on the PR that deleted the LLVM vector types.

Also improve vector type constraints by specifying the
`mlir::VectorType` C++ class, so that explicit casts to `VectorType` can
be avoided in some places.

1 files changed, 1 insertions, 1 deletions

diff --git a/mlir/lib/Target/LLVMIR/ModuleImport.cpp b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
index 2859abdb..187f1bd 100644
--- a/mlir/lib/Target/LLVMIR/ModuleImport.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
@@ -826,7 +826,7 @@ static Type getVectorTypeForAttr(Type type, ArrayRef<int64_t> arrayShape = {}) {
   }
 
   // An LLVM dialect vector can only contain scalars.
-  Type elementType = LLVM::getVectorElementType(type);
+  Type elementType = cast<VectorType>(type).getElementType();
   if (!elementType.isIntOrFloat())
     return {};