invoke.texi: Document new switches -Wno-shadow-ivar, -fno-local-ivars and -fivar...

invoke.texi: Document new switches -Wno-shadow-ivar, -fno-local-ivars and -fivar-visibility.

2014-05-12  Dimitris Papavasiliou  <dpapavas@gmail.com>

	    * doc/invoke.texi: Document new switches -Wno-shadow-ivar,
	    -fno-local-ivars and -fivar-visibility.
	    * c-family/c.opt: Make -Wshadow also implicitly enable
	    -Wshadow-ivar.

testsuite:
	    * objc.dg/shadow-1.m: New test.
	    * objc.dg/shadow-2.m: New test.
	    * objc.dg/ivar-scope-1.m: New test.
	    * objc.dg/ivar-scope-2.m: New test.
	    * objc.dg/ivar-scope-3.m: New test.
	    * objc.dg/ivar-scope-4.m: New test.
	    * objc.dg/ivar-visibility-1.m: New test.
	    * objc.dg/ivar-visibility-2.m: New test.
	    * objc.dg/ivar-visibility-3.m: New test.
	    * objc.dg/ivar-visibility-4.m: New test.

From-SVN: r210333