[Bug bootstrap/78390] [7 Regression] Bootstrap failure: match.pd: cannot determine type of operand

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78390

--- Comment #17 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Combine should probably not try to generate this extract, I wonder if it
can exist on any target.  So where is it coming from?

Of course the target should not "successfully" match it ;-)