[Bug tree-optimization/86622] [9 Regression] incorrect strlen of array of array plus variable offset

[um at mutluit dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86622

--- Comment #5 from U.Mutlu <um at mutluit dot com> ---
I have to correct myself in #2 and #3. 
The code is correct, and should return n=6.