Utils: Convert to SmallStringView for comparison

Change-Id: I38d9716225b81091e8e75b26c9c2258a2aefa987
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/utils/smallstringiterator.h

@@ -41,6 +41,7 @@ struct SmallStringIterator : public  std::iterator<Category, Type, DistanceType,
 {
     SmallStringIterator() noexcept = default;
 
+    constexpr
     SmallStringIterator(Pointer ptr) noexcept : pointer_(ptr)
     {
     }