C++ PATCH for c++/57850 (-fdump-translation-unit and PCH)

[Jason Merrill]

Early exit from cp_write_global_declarations in the PCH case completely 
broke -fdump-translation-unit; the simple fix is just to do the dump on 
the PCH path as well.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.8.
commit 106091d492179afa32d3042c4c74fb2ae6c440f4
Author: Jason Merrill <ja...@redhat.com>
Date:   Thu Sep 12 18:33:21 2013 -0400
    	PR c++/57850
    	* decl2.c (dump_tu): Split out from...
    	(cp_write_global_declarations): ...here.  Call it in PCH mode.

diff --git a/gcc/cp/decl2.c b/gcc/cp/decl2.c
index 4ebc155..5e5f5e8 100644
--- a/gcc/cp/decl2.c
+++ b/gcc/cp/decl2.c
@@ -4041,6 +4041,22 @@ handle_tls_init (void)
   expand_or_defer_fn (finish_function (0));
 }
 
+/* The entire file is now complete.  If requested, dump everything
+   to a file.  */
+
+static void
+dump_tu (void)
+{
+  int flags;
+  FILE *stream = dump_begin (TDI_tu, &flags);
+
+  if (stream)
+    {
+      dump_node (global_namespace, flags & ~TDF_SLIM, stream);
+      dump_end (TDI_tu, stream);
+    }
+}
+
 /* This routine is called at the end of compilation.
    Its job is to create all the code needed to initialize and
    destroy the global aggregates.  We do the destruction
@@ -4071,6 +4087,7 @@ cp_write_global_declarations (void)
   if (pch_file)
     {
       c_common_write_pch ();
+      dump_tu ();
       return;
     }
 
@@ -4457,16 +4474,7 @@ cp_write_global_declarations (void)
 
   /* The entire file is now complete.  If requested, dump everything
      to a file.  */
-  {
-    int flags;
-    FILE *stream = dump_begin (TDI_tu, &flags);
-
-    if (stream)
-      {
-	dump_node (global_namespace, flags & ~TDF_SLIM, stream);
-	dump_end (TDI_tu, stream);
-      }
-  }
+  dump_tu ();
 
   if (flag_detailed_statistics)
     {