Utils: Add _sv literal for SmallStringView

You can now write "text"_sv to get SmallStringView

Change-Id: I4a5172c97b9bfb283360037ebb934c589ad5a2d8
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/utils/smallstringview.h

@@ -193,3 +193,11 @@ int reverseCompare(const SmallStringView& first, const SmallStringView& second)
 }
 
 } // namespace Utils
+
+#ifdef __cpp_user_defined_literals
+inline
+constexpr Utils::SmallStringView operator""_sv(const char *const string, size_t size)
+{
+    return Utils::SmallStringView(string, size);
+}
+#endif