Update Darwin tests to reflect the differences in symbol names and section
 usage.

gcc/testsuite/

2016-11-27  Dominique d'Humieres  <dominiq@lps.ens.fr>
	    Iain Sandoe  <iain@codesourcery.com>

	PR target/71767
	* g++.dg/abi/key2.C: Adjust for changed Darwin sections and
	linker-visible symbols.
	* g++.dg/torture/darwin-cfstring-3.C: Likewise.
	* gcc.dg/const-uniq-1.c: Likewise.
	* gcc.dg/torture/darwin-cfstring-3.c: Likewise.
	* gcc.target/i386/pr70799-1.c: Likewise.


Co-Authored-By: Iain Sandoe <iain@codesourcery.com>

From-SVN: r242896