[mlir] Update vector return types for .getMixed* methods (NFC) (#133821)

Drop small size to make vector types match the generic helper
`getMixedValues` in `StaticValueUtils.h`.

This saves some needles vector copies. I didn't find any local variables
that need updating.

Author: kuhar

mlir/include/mlir/Interfaces/ViewLikeInterface.td

@@ -160,7 +160,7 @@ def OffsetSizeAndStrideOpInterface : OpInterface<"OffsetSizeAndStrideOpInterface
       /*desc=*/[{
         Return a vector of all the static or dynamic offsets of the op.
       }],
-      /*retTy=*/"::llvm::SmallVector<::mlir::OpFoldResult, 4>",
+      /*retTy=*/"::llvm::SmallVector<::mlir::OpFoldResult>",
       /*methodName=*/"getMixedOffsets",
       /*args=*/(ins),
       /*methodBody=*/"",
@@ -174,7 +174,7 @@ def OffsetSizeAndStrideOpInterface : OpInterface<"OffsetSizeAndStrideOpInterface
       /*desc=*/[{
         Return a vector of all the static or dynamic sizes of the op.
       }],
-      /*retTy=*/"::llvm::SmallVector<::mlir::OpFoldResult, 4>",
+      /*retTy=*/"::llvm::SmallVector<::mlir::OpFoldResult>",
       /*methodName=*/"getMixedSizes",
       /*args=*/(ins),
       /*methodBody=*/"",
@@ -188,7 +188,7 @@ def OffsetSizeAndStrideOpInterface : OpInterface<"OffsetSizeAndStrideOpInterface
       /*desc=*/[{
         Return a vector of all the static or dynamic strides of the op.
       }],
-      /*retTy=*/"::llvm::SmallVector<::mlir::OpFoldResult, 4>",
+      /*retTy=*/"::llvm::SmallVector<::mlir::OpFoldResult>",
       /*methodName=*/"getMixedStrides",
       /*args=*/(ins),
       /*methodBody=*/"",