re PR tree-optimization/85720 (bad codegen for looped assignment of primitives at -O2)
PR tree-optimization/85720
* tree-loop-distribution.c (break_alias_scc_partitions): Don't merge
SCC if all partitions are builtins.
(version_loop_by_alias_check): New parameter. Generate cancelable
runtime alias check if all partitions are builtins.
(distribute_loop): Update call to above function.