Fix ICE with flatten on uninlinable call

[Jan Hubicka]

Hi,
this patch fixes ICE where we manage to lose the CIF_FINAL failure on inlining.

Bootstrapped/regtested x86_64-linux, comitted.

Honza

        PR ipa/83051
        * ipa-inline.c (flatten_function): Do not overwrite final inlining
        failure.
        * gcc.c-torture/compile/pr83051-2.c: New testcase.
Index: ipa-inline.c
===================================================================
--- ipa-inline.c        (revision 256795)
+++ ipa-inline.c        (working copy)
@@ -2083,7 +2083,8 @@ flatten_function (struct cgraph_node *no
                     "Not inlining %s into %s to avoid cycle.\n",
                     xstrdup_for_dump (callee->name ()),
                     xstrdup_for_dump (e->caller->name ()));
-         e->inline_failed = CIF_RECURSIVE_INLINING;
+         if (cgraph_inline_failed_type (e->inline_failed) != CIF_FINAL_ERROR)
+           e->inline_failed = CIF_RECURSIVE_INLINING;
          continue;
        }
 
Index: testsuite/gcc.c-torture/compile/pr83051-2.c
===================================================================
--- testsuite/gcc.c-torture/compile/pr83051-2.c (revision 0)
+++ testsuite/gcc.c-torture/compile/pr83051-2.c (working copy)
@@ -0,0 +1,12 @@
+/* { dg-options "-fno-early-inlining" } */
+void
+bar ()
+{
+  bar (0);
+}
+
+__attribute__ ((flatten))
+void foo ()
+{
+  bar ();
+}