[pph] Save/restore PARM_DECL DECL_ARG_TYPE (issue4441079)

[Lawrence Crowl]

This patch saves and restores the PARM_DECL DECL_ARG_TYPE in the PPH file.

Index: gcc/cp/ChangeLog.pph

2011-04-28  Lawrence Crowl <cr...@google.com>

        * pph-streamer-out.c (pph_stream_write_tree): Write PARM_DECL
        DECL_ARG_TYPE.
        * pph-streamer-in.c (pph_stream_read_tree): Read PARM_DECL
        DECL_ARG_TYPE.


Index: gcc/cp/pph-streamer-in.c
===================================================================
--- gcc/cp/pph-streamer-in.c    (revision 173124)
+++ gcc/cp/pph-streamer-in.c    (working copy)
@@ -791,6 +791,8 @@ pph_stream_read_tree (struct lto_input_b
          pph_stream_read_lang_specific (stream, expr);
          if (TREE_CODE (expr) == FUNCTION_DECL)
            DECL_SAVED_TREE (expr) = pph_input_tree (stream);
+         else if (TREE_CODE (expr) == PARM_DECL)
+           DECL_ARG_TYPE (expr) = pph_input_tree (stream);
        }
 
       if (TREE_CODE (expr) == TYPE_DECL)
Index: gcc/cp/pph-streamer-out.c
===================================================================
--- gcc/cp/pph-streamer-out.c   (revision 173124)
+++ gcc/cp/pph-streamer-out.c   (working copy)
@@ -796,6 +796,8 @@ pph_stream_write_tree (struct output_blo
 
          if (TREE_CODE (expr) == FUNCTION_DECL)
            pph_output_tree_or_ref_1 (stream, DECL_SAVED_TREE (expr), ref_p, 3);
+         else if (TREE_CODE (expr) == PARM_DECL)
+           pph_output_tree_or_ref_1 (stream, DECL_ARG_TYPE (expr), ref_p, 3);
        }
 
       if (TREE_CODE (expr) == TYPE_DECL)

--
This patch is available for review at http://codereview.appspot.com/4441079