Add tm-i386v4.h and xm-i386v4.h to Sanitize, add i386/SVR4 to configuration

file, recognize names beginning with '.' as compiler generated "fake" tags
for anonymous structures, unions and enums.  Add target dependent functions
for SVR4 /proc register interface (i386-tdep.c).

gdb/tm-i386v4.h

@@ -0,0 +1,38 @@
+/* Macro definitions for GDB on an Intel i386 running SVR4.
+   Copyright (C) 1991, Free Software Foundation, Inc.
+   Written by Fred Fish at Cygnus Support (fnf@cygint)
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Use the alternate method of determining valid frame chains. */
+
+#define FRAME_CHAIN_VALID_ALTERNATE
+
+/* number of traps that happen between exec'ing the shell 
+ * to run an inferior, and when we finally get to 
+ * the inferior code.  This is 2 on most implementations.
+ */
+#define START_INFERIOR_TRAPS_EXPECTED 2
+
+#include "tm-svr4.h"
+#include "tm-i386v.h"
+
+/* We can't tell how many args there are
+   now that the C compiler delays popping them.  */
+
+#undef FRAME_NUM_ARGS
+#define FRAME_NUM_ARGS(val,fi) (val = -1)