Fix tree-inlinine ICE with uninitializer return value

[Jan Hubicka]

Hi,
the code path handling the case where callee is missing return statement but 
calle
statement has LHS is broken in tree-inline since anonymous SSA_NAMEs was 
introduced.
This code is not not used because all those inlines are disabled by 
gimple_check_call_matching_types, but since I would like to drop the checks it 
seems
good idea to fix the code path rather than dropping it.  This copies what 
Jakub's
code does when redirecting to unreachable.

Bootstrapped/regtesetd x86_64-linux, OK?

Honza

        * tree-inline.c (expand_call_inline): Fix path inlining function
        with no return statement.
Index: tree-inline.c
===================================================================
--- tree-inline.c       (revision 235839)
+++ tree-inline.c       (working copy)
@@ -4708,7 +4708,7 @@ expand_call_inline (basic_block bb, gimp
        {
          tree name = gimple_call_lhs (stmt);
          tree var = SSA_NAME_VAR (name);
-         tree def = ssa_default_def (cfun, var);
+         tree def = var ? ssa_default_def (cfun, var) : NULL;
 
          if (def)
            {
@@ -4719,6 +4719,11 @@ expand_call_inline (basic_block bb, gimp
            }
          else
            {
+             if (!var)
+               {
+                 tree var = create_tmp_reg_fn (cfun, TREE_TYPE (name), NULL);
+                 SET_SSA_NAME_VAR_OR_IDENTIFIER (name, var);
+               }
              /* Otherwise make this variable undefined.  */
              gsi_remove (&stmt_gsi, true);
              set_ssa_default_def (cfun, var, name);