Add dg-require-effective-target indirect_jumps for g++

Add dg-require-effective-target indirect_jumps for g++

2018-01-12  Tom de Vries  <tom@codesourcery.com>

	* g++.dg/ext/label13.C: Add dg-require-effective-target indirect_jumps.
	* g++.dg/ext/label13a.C: Same.
	* g++.dg/ext/label14.C: Same.
	* g++.dg/ext/label2.C: Same.
	* g++.dg/ext/label3.C: Same.
	* g++.dg/torture/pr42462.C: Same.
	* g++.dg/torture/pr42739.C: Same.
	* g++.dg/warn/Wunused-label-3.C: Same.

From-SVN: r256571