[Bug c++/84502] Argument corruption when passing empty templated struct

[patrick.schlangen at bmw dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84502

--- Comment #1 from patrick.schlangen at bmw dot de ---
Note: This problem does not happen with gcc 7.2.1.

The problem can also be reproduced with -O3 when the empty struct object passed
to the function is actually used in the function. (So it is not optimized out.)