[Bug middle-end/115091] Support value speculation in frontend

[andi-gcc at firstfloor dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115091

--- Comment #4 from Andi Kleen <andi-gcc at firstfloor dot org> ---
Bumping this up because I just heard of a real case where inline assembler was
needed to implement this technique.