[Bug tree-optimization/83296] missing -Wstringop-overflow due to missing range info for MAX_EXPR

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83296

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Note that -fdump-tree-optimized-all includes the range information in the dump.
Normally, we know how to derive a range for MAX_EXPR, but in this case the
MAX_EXPR only appears in phiopt3, later than VRP2. On the other hand, we knew
the range before phiopt, and phiopt for some reason decided to use a new
SSA_NAME and drop the range, that looks suboptimal.