Fix bug 44190 - wrong code with #pragma pack(1)

https://github.com/llvm/llvm-project/commit/5b330e8d6122c336d81dfd11c864e6c6240a381e caused
a regression on s390:

https://bugs.llvm.org/show_bug.cgi?id=44190

we need to copy if if either the argument is non-byval or the argument is underaligned.

Differential Revision: https://reviews.llvm.org/D71282