[Bug lto/66394] [4.9/5/6 Regression] ICE in -flto -fmerge-all-constants -fno-use-linker-plugin targetting i686-w64-mingw32

[sthalik at misaki dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66394

--- Comment #8 from Stanisław Halik <sthalik at misaki dot pl> ---
I can confirm all the code builds with LTO and -fmerge-all-constants after
applying the patch. LTO with linker plugin results in unresolved symbols, but
this is for another time.

Best regards.