[gcc r12-9096] ipa: Release body more carefully when removing nodes (PR 107944)

[Martin Jambor]

https://gcc.gnu.org/g:8495d80f44488b2566afc84b3f5704dd7c999e21

commit r12-9096-g8495d80f44488b2566afc84b3f5704dd7c999e21
Author: Martin Jambor <mjambor@suse.cz>
Date:   Wed Feb 1 18:58:09 2023 +0100

    ipa: Release body more carefully when removing nodes (PR 107944)
    
    The code removing function bodies when the last call graph clone of a
    node is removed is too aggressive when there are nodes up the
    clone_of chain which still need them.  Fixed by expanding the check.
    
    gcc/ChangeLog:
    
    2023-01-18  Martin Jambor  <mjambor@suse.cz>
    
            PR ipa/107944
            * cgraph.cc (cgraph_node::remove): Check whether nodes up the
            lcone_of chain also do not need the body.
    
    (cherry picked from commit db959e250077ae6b4fc08f53fb322719582c5de6)

Diff:
---
 gcc/cgraph.cc | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/gcc/cgraph.cc b/gcc/cgraph.cc
index 4bb9e7ba6af..3734c85db63 100644
--- a/gcc/cgraph.cc
+++ b/gcc/cgraph.cc
@@ -1895,8 +1895,18 @@ cgraph_node::remove (void)
   else if (clone_of)
     {
       clone_of->clones = next_sibling_clone;
-      if (!clone_of->analyzed && !clone_of->clones && !clones)
-	clone_of->release_body ();
+      if (!clones)
+	{
+	  bool need_body = false;
+	  for (cgraph_node *n = clone_of; n; n = n->clone_of)
+	    if (n->analyzed || n->clones)
+	      {
+		need_body = true;
+		break;
+	      }
+	  if (!need_body)
+	    clone_of->release_body ();
+	}
     }
   if (next_sibling_clone)
     next_sibling_clone->prev_sibling_clone = prev_sibling_clone;