PR c++/69523 make -Wliteral-suffix control warning

PR c++/69523 make -Wliteral-suffix control warning

gcc:

	PR c++/69523
	* doc/invoke.texi (C++ Dialect Options) [-Wliteral-suffix]: Update
	description.

gcc/cp:

2017-02-19  Eric Fiselier  <eric@efcs.ca>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR c++/69523
	* parser.c (cp_parser_unqualified_id): Use OPT_Wliteral_suffix to
	control warning about literal suffix identifiers without a leading
	underscore.

gcc/testsuite:

2017-02-19  Eric Fiselier  <eric@efcs.ca>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR c++/69523
	* g++.dg/cpp0x/Wliteral-suffix2.C: New test.

From-SVN: r245574