patch 8.1.1076: file for Insert mode is much too big

Problem:    File for Insert mode is much too big.
Solution:   Split off the code for Insert completion. (Yegappan Lakshmanan,
            closes #4044)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 06f8155..72ffd52 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -2603,7 +2603,7 @@
 
     RedrawingDisabled = 0;
     ins_compl_check_keys(0, TRUE);
-    rettv->vval.v_number = compl_interrupted;
+    rettv->vval.v_number = ins_compl_interrupted();
     RedrawingDisabled = saved;
 }