[gcc r17-3484] [IPA] Apply computed profile scaling

https://gcc.gnu.org/g:89f8552e424c431cbd02f21f133a1c6c60a5c983

commit r17-3484-g89f8552e424c431cbd02f21f133a1c6c60a5c983
Author: Kugan Vivekanandarajah <[email protected]>
Date:   Fri Aug 21 11:07:22 2026 +1000

    [IPA] Apply computed profile scaling
    
    cgraph_node::scale_profile_to computed an adjusted scale but never
    applied it, leaving callgraph edges stale after IPA-CP clone
    redistribution and causing edge/BB count verification failures.
    
    The stale counts triggered this ICE during AutoFDO LTO compilation:
    
      internal compiler error: verify_cgraph_node failed
      #0  internal_error(char const*, ...)
          .../gcc/diagnostic-global-context.cc:787
      #1  cgraph_node::verify_node()
          .../gcc/cgraph.cc:4510
      #2  symtab_node::verify()
          .../gcc/symtab.cc:1377
      #3  optimize_inline_calls(tree_node*)
          .../gcc/tree-inline.cc:5679
      #4  inline_transform(cgraph_node*)
          .../gcc/ipa-inline-transform.cc:871
      #5  execute_one_ipa_transform_pass
          .../gcc/passes.cc:2327
      #6  execute_all_ipa_transforms(bool)
          .../gcc/passes.cc:2390
      #7  cgraph_node::expand()
          .../gcc/cgraphunit.cc:1867
      #8  cgraph_node::expand()
          .../gcc/cgraphunit.cc:1827
      #9  expand_all_functions
          .../gcc/cgraphunit.cc:2057
      #10 symbol_table::compile()
          .../gcc/cgraphunit.cc:2435
      #11 lto_main()
          .../gcc/lto/lto.cc:718
    
    gcc/ChangeLog:
    
            * cgraph.cc (cgraph_node::scale_profile_to): Apply the computed scale.

Diff:
---
 gcc/cgraph.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/cgraph.cc b/gcc/cgraph.cc
index cdb3201f49ce..404bc222d18a 100644
--- a/gcc/cgraph.cc
+++ b/gcc/cgraph.cc
@@ -314,6 +314,7 @@ cgraph_node::scale_profile_to (profile_count ipa_count)
   profile_count num = count.combine_with_ipa_count (ipa_count);
   profile_count den = count;
   profile_count::adjust_for_ipa_scaling (&num, &den);
+  apply_scale (num, den);
 }
 
 /* Insert a new cgraph_function_version_info node into cgraph_fnver_htab