invoke.texi: Remove the documentation about option -Wunreachable-code.

invoke.texi: Remove the documentation about option -Wunreachable-code.

2010-01-05  Eric Fisher  <joefoxreal@gmail.com>

	* doc/invoke.texi: Remove the documentation about option
	-Wunreachable-code.
	* common.opt (Wunreachable-code):  Preserved for backward
	compatibility.
	* tree-cfg.c: Remove the implementation of -Wunreachable-code.
	* opts.c (common_handle_option): Add OPT_Wunreachable_code to
	the backward compatibility flag section.

	* gcc.dg/pr12603.c: Remove -Wunreachable-code from dg-options.
	* gcc.dg/Wunreachable-1.c: Remove the testcase of
	-Wunreachable-code.
	* gcc.dg/Wunreachable-2.c: Likewise.
	* gcc.dg/Wunreachable-3.c: Likewise.
	* gcc.dg/Wunreachable-4.c: Likewise.
	* gcc.dg/Wunreachable-5.c: Likewise.
	* gcc.dg/Wunreachable-6.c: Likewise.
	* gcc.dg/Wunreachable-7.c: Likewise.
	* gcc.dg/Wunreachable-8.c: Likewise.
	* gcc.dg/20041231-1.c: Likewise.

From-SVN: r155645