[PATCH] Fix bootstrap with -O3

[Marek Polacek]

When bootstrapping with BOOT_FLAGS='-O3 -g', I get:
/home/polacek/src/gcc/gcc/c/c-parser.c: In function ‘c_expr 
c_parser_postfix_expression_after_primary(c_parser*, location_t, c_expr)’:
/home/polacek/src/gcc/gcc/c/c-parser.c:6908:16: error: ‘origtypes’ may be used 
uninitialized in this function [-Werror=maybe-uninitialized]
So this patch explicitly initializes origtypes to NULL.

Regtested/bootstrapped (with BOOT_FLAGS='-O3 -g') on x86_64-linux,
ok for trunk?

2013-02-07  Marek Polacek  <pola...@redhat.com>

        * c-parser.c (origtypes): Initialize to NULL.

--- gcc/c-parser.c.mp   2013-02-07 17:50:10.286742403 +0100
+++ gcc/c-parser.c      2013-02-07 17:50:23.331781876 +0100
@@ -6864,7 +6864,7 @@ c_parser_postfix_expression_after_primar
   tree sizeof_arg[3];
   unsigned int i;
   vec<tree, va_gc> *exprlist;
-  vec<tree, va_gc> *origtypes;
+  vec<tree, va_gc> *origtypes = NULL;
   while (true)
     {
       location_t op_loc = c_parser_peek_token (parser)->location;

        Marek