[PATCH] [3/n] Fix minor SSA_NAME leaks

[Jeff Law]

And other minor leak.  This time in tree-stdarg.  Unlike other cases, 
we're dropping just the virtual definition, other definitions on the 
statement need to be preserved (they're going to be re-used). 
Additionally, this one is missing the call to unlink_stmt_vdef.

Like other cases, I've got a minimized test, but no good way to add it 
to the testsuite right now.

Bootstrapped and regression tested on x86_64-linux-gnu.  Installed on 
the trunk.

Jeff
commit 4d303443cc66bf32f3f045014dd22f0e475f0d50
Author: Jeff Law <l...@redhat.com>
Date:   Thu Oct 8 14:46:03 2015 -0600

    [PATCH] [3/n] Fix minor SSA_NAME leaks
    
        * tree-stdarg.c (expand_ifn_va_arg_1): Add missing call to
        unlink_stmt_vdef and release_ssa_name_fn.

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 64309c1..31e2f30 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 2015-10-08  Jeff Law  <l...@redhat.com>
 
+       * tree-stdarg.c (expand_ifn_va_arg_1): Add missing call to
+       unlink_stmt_vdef and release_ssa_name_fn.
+
        * tree-ssa-dse.c (dse_optimize_stmt): Add missing call to
        release_defs.
 
diff --git a/gcc/tree-stdarg.c b/gcc/tree-stdarg.c
index d69fa06..3e6d98c 100644
--- a/gcc/tree-stdarg.c
+++ b/gcc/tree-stdarg.c
@@ -1080,6 +1080,8 @@ expand_ifn_va_arg_1 (function *fun)
 
        /* Remove the IFN_VA_ARG gimple_call.  It's the last stmt in the
           bb.  */
+       unlink_stmt_vdef (stmt);
+       release_ssa_name_fn (fun, gimple_vdef (stmt));
        gsi_remove (&i, true);
        gcc_assert (gsi_end_p (i));