Fix ipa-inline-transform ICE

[Jan Hubicka]

Hi,
the ipa-inline-transform ICE is caused by fact that devirt_benefit in
ipa-inline-analysis is able to determine devirtualiation oppurtunity of call to
b3, while the ipa-prop responsible for updating function body after inlining is
not.  This is because the later is missing code turning known constant into
binfo.

Bootstrapped/regtested x86_64-linux, will commit this shortly.

Honza
        
        PR tree-optimization/55683
        * g++.dg/ipa/devirt-9.C: New testcase.

        * ipa-prop.c (try_make_edge_direct_virtual_call): Look into constants 
for binfo.
Index: testsuite/g++.dg/ipa/devirt-9.C
===================================================================
*** testsuite/g++.dg/ipa/devirt-9.C     (revision 0)
--- testsuite/g++.dg/ipa/devirt-9.C     (revision 0)
***************
*** 0 ****
--- 1,30 ----
+ /* { dg-do compile } */
+ /* { dg-options "-O2 -fdump-ia-inline"  } */
+ double foo ();
+ struct B
+ {
+   bool b1 () { return b3 (); }
+   void b2 ();
+   virtual bool b3 ();
+ };
+ struct C
+ {
+   C () {}
+   bool
+   c1 (float x, float y)
+   {
+     if (x != c3 || y != c4)
+       c2.b2 ();
+     return c2.b1 ();
+   }
+   B c2;
+   float c3, c4;
+ };
+ 
+ void
+ bar ()
+ {
+   static C c;
+   c.c1 (60, (int) foo ());
+ }
+ /* { dg-final { scan-ipa-dump "Discovered a virtual call to a known target"  
"inline"  } } */
Index: ipa-prop.c
===================================================================
*** ipa-prop.c  (revision 194584)
--- ipa-prop.c  (working copy)
*************** try_make_edge_direct_virtual_call (struc
*** 2223,2231 ****
  
    binfo = ipa_value_from_jfunc (new_root_info, jfunc);
  
!   if (!binfo || TREE_CODE (binfo) != TREE_BINFO)
      return NULL;
  
    binfo = get_binfo_at_offset (binfo, ie->indirect_info->offset,
                               ie->indirect_info->otr_type);
    if (binfo)
--- 2223,2238 ----
  
    binfo = ipa_value_from_jfunc (new_root_info, jfunc);
  
!   if (!binfo)
      return NULL;
  
+   if (TREE_CODE (binfo) != TREE_BINFO)
+     {
+       binfo = gimple_extract_devirt_binfo_from_cst (binfo);
+       if (!binfo)
+         return NULL;
+     }
+ 
    binfo = get_binfo_at_offset (binfo, ie->indirect_info->offset,
                               ie->indirect_info->otr_type);
    if (binfo)