Improve readability of debug_tree() dumps for SSA_NAME and VECTOR_CST

gcc/ChangeLog:

	* print-tree.c (print_node) [VECTOR_CST]: Coalesce the output of
	identical consecutive elements.
	[SSA_NAME]: Print the name's def stmt on its own line.  When printing
	the node's def stmt, avoid printing an unwanted trailing newline by
	replacing the call to print_gimple_stmt() with its inlined body and
	adjusting it to not set pp_needs_newline and to call pp_flush()
	instead of pp_newline_and_flush().

From-SVN: r239661

gcc/ChangeLog

+2016-08-22  Patrick Palka  <ppalka@gcc.gnu.org>
+
+	* print-tree.c (print_node) [VECTOR_CST]: Coalesce the output of
+	identical consecutive elements.
+	[SSA_NAME]: Print the name's def stmt on its own line.  When printing
+	the node's def stmt, avoid printing an unwanted trailing newline by
+	replacing the call to print_gimple_stmt() with its inlined body and
+	adjusting it to not set pp_needs_newline and to call pp_flush()
+	instead of pp_newline_and_flush().
+
 2016-08-22  Joseph Myers  <joseph@codesourcery.com>
 
 	* tree.h (CASE_FLT_FN_FLOATN_NX, float16_type_node)

gcc/print-tree.c

@@ -770,8 +770,18 @@ print_node (FILE *file, const char *prefix, tree node, int indent)
 
 	    for (i = 0; i < VECTOR_CST_NELTS (node); ++i)
 	      {
-		sprintf (buf, "elt%u: ", i);
+		unsigned j;
+		/* Coalesce the output of identical consecutive elements.  */
+		for (j = i + 1; j < VECTOR_CST_NELTS (node); j++)
+		  if (VECTOR_CST_ELT (node, j) != VECTOR_CST_ELT (node, i))
+		    break;
+		j--;
+		if (i == j)
+		  sprintf (buf, "elt%u: ", i);
+		else
+		  sprintf (buf, "elt%u...elt%u: ", i, j);
 		print_node (file, buf, VECTOR_CST_ELT (node, i), indent + 4);
+		i = j;
 	      }
 	  }
 	  break;
@@ -869,8 +879,14 @@ print_node (FILE *file, const char *prefix, tree node, int indent)
 
 	case SSA_NAME:
 	  print_node_brief (file, "var", SSA_NAME_VAR (node), indent + 4);
+	  indent_to (file, indent + 4);
 	  fprintf (file, "def_stmt ");
-	  print_gimple_stmt (file, SSA_NAME_DEF_STMT (node), indent + 4, 0);
+	  {
+	    pretty_printer buffer;
+	    buffer.buffer->stream = file;
+	    pp_gimple_stmt_1 (&buffer, SSA_NAME_DEF_STMT (node), indent + 4, 0);
+	    pp_flush (&buffer);
+	  }
 
 	  indent_to (file, indent + 4);
 	  fprintf (file, "version %u", SSA_NAME_VERSION (node));