[Bug rtl-optimization/91994] [10 Regression] r276327 miscompiled 557.xz_r in SPEC CPU 2017

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91994

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
liblzma/check/sha256.c is miscompiled.