[Bug target/77333] Incorrect stack adjust in epilogue when targeting i686-w64-mingw32

[tony at kelman dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77333

--- Comment #19 from Tony Kelman <tony at kelman dot net> ---
The patch also applies and fixes the problem on the gcc-5-branch. I haven't
tried with trunk.