[Bug rtl-optimization/67736] Wrong optimization with -fexpensive-optimizations on mips64el

[aurelien at aurel32 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67736

--- Comment #3 from Aurelien Jarno <aurelien at aurel32 dot net> ---
The ffmpeg testsuite is successful on mips64el-linux-gnu with this patch
applied.