[Bug tree-optimization/81982] [arm] libstdc++ miscompiled, constant propagation is broken on native arm

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81982

--- Comment #1 from nsz at gcc dot gnu.org ---
Created attachment 42044
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42044&action=edit
good ccp1 output from -fdump-tree-all