[Bug 38653] GCC 5.1 breaks -O2 optimization with 64-bit Wine

https://bugs.winehq.org/show_bug.cgi?id=38653

--- Comment #19 from Austin English  ---
(In reply to Marcus Meissner from comment #18)
> The wine staging bug references as first comment a 32bit backtrace.
>
> I have found the next crash during 64bit startup, in rpcrt4 and reported it
> to gcc.
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66845

Thanks Marcus. I attempted to test this fix last night, but noticed that gcc
from SVN (trunk, not 5.1 branch) causes wineboot to segfault on start. Applying
the patch on top of the original broken commit (again, in trunk branch) failed
to build.