Fix linking MSVC error from forward declaration used as templated type (iree-org#22233)

Fixes a build error for MSVC:
https://discord.com/channels/689900678990135345/689957613152239638/1425159686247809054

The MSVC compiler doesn't support using forward declared classes as
template types, so this PR just includes the relevant file instead of
forward declaring.

Confirmed that the MSVC CI action passes:
https://github.com/iree-org/iree/actions/runs/18320843225/job/52173225710

Signed-off-by: Max Dawkins <[email protected]>

Author: Max191

compiler/src/iree/compiler/Dialect/Encoding/Utils/Utils.cpp

@@ -6,7 +6,6 @@
 
 #include "iree/compiler/Dialect/Encoding/Utils/Utils.h"
 
-#include "iree/compiler/Dialect/LinalgExt/Utils/MatchUtils.h"
 #include "llvm/ADT/SmallVector.h"
 #include "mlir/Dialect/Linalg/Utils/Utils.h"
 #include "mlir/IR/AffineMap.h"

compiler/src/iree/compiler/Dialect/Encoding/Utils/Utils.h

@@ -8,14 +8,11 @@
 #define IREE_COMPILER_DIALECT_ENCODING_UTILS_UTILS_H_
 
 #include "iree/compiler/Dialect/Encoding/IR/EncodingTypes.h"
+#include "iree/compiler/Dialect/LinalgExt/Utils/MatchUtils.h"
 #include "mlir/IR/Attributes.h"
 #include "mlir/IR/BuiltinAttributes.h"
 #include "mlir/IR/BuiltinTypes.h"
 
-namespace mlir::iree_compiler::IREE::LinalgExt {
-class ScaledContractionDimensions;
-} // namespace mlir::iree_compiler::IREE::LinalgExt
-
 namespace mlir::iree_compiler::IREE::Encoding {
 
 constexpr char kDataTilingHint[] = "iree.opt.data_tiling";