[Bug tree-optimization/65443] Don't peel last iteration from loop in transform_to_exit_first_loop

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65443

--- Comment #13 from vries at gcc dot gnu.org ---
Created attachment 35145
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35145&action=edit
WIP patch

Added reduction example to testcases. Patch runs test-cases successfully.