TextureTools: pass StridedArrayView via const&.

It's bigger than two pointers.

src/Magnum/TextureTools/Atlas.cpp

@@ -65,7 +65,7 @@ std::vector<Range2Di> atlas(const Vector2i& atlasSize, const std::vector<Vector2
     return atlas;
 }
 
-Containers::Pair<Int, Containers::Array<Vector3i>> atlasArrayPowerOfTwo(const Vector2i& layerSize, const Containers::StridedArrayView1D<const Vector2i> sizes) {
+Containers::Pair<Int, Containers::Array<Vector3i>> atlasArrayPowerOfTwo(const Vector2i& layerSize, const Containers::StridedArrayView1D<const Vector2i>& sizes) {
     CORRADE_ASSERT(layerSize.product() && layerSize.x() == layerSize.y() && (layerSize & (layerSize - Vector2i{1})).isZero(),
         "TextureTools::atlasArrayPowerOfTwo(): expected layer size to be a non-zero power-of-two square, got" << Debug::packed << layerSize, {});
 

src/Magnum/TextureTools/Atlas.h

@@ -72,7 +72,7 @@ atlasing in a single @f$ \mathcal{O}(n) @f$ operation. Due to the sort
 involved, a temporary allocation holds the sorted array and additionally
 @ref std::stable_sort() performs its own allocation.
 */
-Containers::Pair<Int, Containers::Array<Vector3i>> MAGNUM_TEXTURETOOLS_EXPORT atlasArrayPowerOfTwo(const Vector2i& layerSize, Containers::StridedArrayView1D<const Vector2i> sizes);
+Containers::Pair<Int, Containers::Array<Vector3i>> MAGNUM_TEXTURETOOLS_EXPORT atlasArrayPowerOfTwo(const Vector2i& layerSize, const Containers::StridedArrayView1D<const Vector2i>& sizes);
 
 /**
  * @overload