[Bug tree-optimization/69400] [5/6 Regression] wrong code with -O and int128

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69400

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Before wide-int:

Lattice value changed to CONSTANT 18446744073709551614.  Adding SSA edges to
worklist.

After wide-int:

Lattice value changed to CONSTANT 0xfffffffffffffffffffffffffffffffe.  Adding
SSA edges to worklist.

It is wrong to sign-extend (__int128) 0xfffffffffffffffe.