patch 8.2.2539: Vim9: return from finally block causes a hang

Problem:    Vim9: return from finally block causes a hang.
Solution:   Store both the finally and endtry indexes. (closes #7885)
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index eb46d35..0fb09fd 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -577,6 +577,16 @@
     counter += 1
   endfor
   assert_equal(4, counter)
+
+  # return in finally after empty catch
+  def ReturnInFinally(): number
+    try
+    finally
+      return 4
+    endtry
+    return 2
+  enddef
+  assert_equal(4, ReturnInFinally())
 enddef
 
 def Test_cnext_works_in_catch()