vm_backtrace.c: ignore ifunc frames

* vm_backtrace.c (rb_profile_frames): ignore ifunc frames as it
  did before.  [ruby-core:72409] [Bug #11851]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53225 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 17 insertions, 0 deletions

diff --git a/test/-ext-/debug/test_profile_frames.rb b/test/-ext-/debug/test_profile_frames.rb
index 860652c0cd..5ea506046e 100644
--- a/test/-ext-/debug/test_profile_frames.rb
+++ b/test/-ext-/debug/test_profile_frames.rb
@@ -102,4 +102,21 @@ class TestProfileFrames < Test::Unit::TestCase
       end
     }
   end
+
+  def test_ifunc_frame
+    bug11851 = '[ruby-core:72409] [Bug #11851]'
+    assert_ruby_status([], <<~'end;', bug11851) # do
+      require '-test-/debug'
+      class A
+        include Bug::Debug
+        def x
+          profile_frames(0, 10)
+        end
+      end
+      def a
+        [A.new].each(&:x)
+      end
+      a
+    end;
+  end
 end