[Bug tree-optimization/123417] [16 Regression] missing sink vs GCC 15

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123417

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Disambiguating loop 2 with multiple latches
Merged latch edges of loop 2

this looks odd.

But

When bb 6 is created we get this phi:
  # BS_INC_1_86 = PHI <_87(22), _87(12)>

I wonder why this degenerate PHI was created in the first place.