[Bug rtl-optimization/69592] [6 Regression] Compile-time and memory-use hog in combine

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69592

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
In SHA512_Compress, -O2 is enough, unoptimized checking GCC 5 branch builds it
in 5s