[Bug ipa/113291] [14 Regression] compilation never (?) finishes with recursive always_inline functions at -O and above since r14-2172

["hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113291

--- Comment #6 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 57427
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57427&action=edit
patch

The patch makes compilation to finish in reasonable time.
I ended up in need to dropping DISREGARD_INLINE_LIMITS in late inlining for
functions with self recursive always inlines, since these grow large quick and
even non-recursive inlining is too slow.  We also end up with quite ugly
diagnostics of form:

tt.c:13:1: error: inlining failed in call to ‘always_inline’ ‘f1’: --param
max-inline-insns-auto limit reached
   13 | f1 (void)
      | ^~
tt.c:17:3: note: called from here
   17 |   f1 ();
      |   ^~~~~
tt.c:6:1: error: inlining failed in call to ‘always_inline’ ‘f0’: --param
max-inline-insns-auto limit reached
    6 | f0 (void)
      | ^~
tt.c:16:3: note: called from here
   16 |   f0 ();
      |   ^~~~~
tt.c:13:1: error: inlining failed in call to ‘always_inline’ ‘f1’: --param
max-inline-insns-auto limit reached
   13 | f1 (void)
      | ^~
tt.c:15:3: note: called from here
   15 |   f1 ();
      |   ^~~~~
In function ‘f1’,
    inlined from ‘f0’ at tt.c:8:3,


which is quite large so I can not add it to a testuiste.  I will see if I can
reduce this even more.