[Bug c/102291] [9/10/11/12 Regression] wrong overflow warning for compound expression conversion and bit_and expressions

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102291

--- Comment #7 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I don't think TREE_OVERFLOW should be introduced in folding expressions 
that didn't have undefined behavior in the original source code.