Add debugging functions for cp_parser (issue4389045)

[crowl@google.com]

One oddity, otherwise LGTM.


http://codereview.appspot.com/4389045/diff/1/gcc/cp/parser.c
File gcc/cp/parser.c (right):

http://codereview.appspot.com/4389045/diff/1/gcc/cp/parser.c#newcode375
gcc/cp/parser.c:375: if (flag)
This code will never print "false", so why have it?

http://codereview.appspot.com/4389045/