[Bug c++/67602] unsigned left-shift overflow should not be undefined in c++

[miyuki at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67602

--- Comment #2 from Mikhail Maltsev <miyuki at gcc dot gnu.org> ---
(In reply to Brad Huntting from comment #0)
> It should be noted that the C standard appears to allow for undefined
> behavior when E2>=N.

And so does the C++ standard:

"... The behavior is undefined if the right operand is negative, or greater
than or equal to the length in bits of the promoted left operand." [expr.shift]
(5.8.1).