[Bug bootstrap/65232] [5 Regression] bootstrap failure (ICE in change_symbol_block, at varasm.c:1230) on arm-linux-gnueabihf, in libstdc++ stage1

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65232

--- Comment #6 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Hmm, it seems we triggered another bug of aliases WRT anchors.  How does the
declarations in question look like? (basically all aliases introduced by
ipa-icf can also be coded by hand).

Is it the path
  /* For a duplicate declaration, we can be called twice on the                 
     same DECL node.  Don't discard the RTL already made.  */                   
  if (DECL_RTL_SET_P (decl))                                                    
...?

Why the declaration is considered duplicate to start with?