[Bug lto/65130] [5 Regression] ICE with LTO on valid code on x86_64-linux-gnu

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65130

--- Comment #10 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
The bug is:

fn3/5 (fn3) @0x7ffff6ae5dc8
  Type: function definition analyzed
  Visibility: prevailing_def_ironly
  previous sharing asm name: 11
  References: a/4 (read)
  Referring: 
  Read from file: b.o
  Availability: local
  First run: 0
  Function flags: local
  Called by: fn2/10 (inlined) (10.11 per call) fn2/0 (1.00 per call) 
  Calls: fn4/2 (inlined) (10.11 per call) 

fn3 is not inlined clone but it is still called by fn2 and inlined into it.
This is why we end up producing a cycle in the inline tree.

This seems to be introduced by code inlining functions called once. I suppose
there is a problem with nodes being removed and walked at the same time. Will
check more tomorrow.