[Bug middle-end/89543] Don't modify TREE_NO_WARNING during folding in place

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89543

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
[apinski@xeond2 upstream-gcc-git]$ gdb --args ./gcc/objdir/stage1-gcc/cc1
/home/apinski/src/upstream-gcc-git/gcc/gcc/testsuite/gcc.dg/Wstringop-overread-6.c

....
(gdb) p debug_generic_expr(expr)
strlen ((const char *) &arr + 4)