[Bug ada/65519] [5 regression] unable to coalesce ssa_names 2 and 87 which are marked as MUST COALESCE

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65519

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's forwprop4 propagating an abnormal SSA name:

  <bb 5>:
  [...]
  I.3_30(ab) = I.3_1 + 1;
  _31 = (interfaces__unsigned_32) I.3_30(ab);

[...]

  <bb 13>:
  _43 = v.P_ARRAY;
  _45 = (sizetype) _31;

is changed into:

  <bb 13>:
  _43 = v.P_ARRAY;
  _71 = I.3_30(ab) & 4294967295;

but I.3_87(ab) is live in BB 13.