Run testsuite/libgomp.c++/c++.exp at -O2 by default

Run testsuite/libgomp.c++/c++.exp at -O2 by default

2015-06-30  Tom de Vries  <tom@codesourcery.com>

	* testsuite/libgomp.c++/c++.exp: Set DEFAULT_CFLAGS to -O2 if not
	already set.  Use DEFAULT_CFLAGS in dg-runtest.
	* testsuite/libgomp.c++/atomic-16.C: Remove dg-options "-O2 -fopenmp".
	* testsuite/libgomp.c++/pr64824.C: Same.
	* testsuite/libgomp.c++/pr64868.C: Same.
	* testsuite/libgomp.c++/pr66199-1.C: Same.
	* testsuite/libgomp.c++/pr66199-2.C: Same.
	* testsuite/libgomp.c++/target-2.C: Same.
	* testsuite/libgomp.c++/for-7.C: Use dg-additional-options for
	-std=<standard> option.
	* testsuite/libgomp.c++/udr-11.C: Same.
	* testsuite/libgomp.c++/udr-12.C: Same.
	* testsuite/libgomp.c++/udr-13.C: Same.
	* testsuite/libgomp.c++/udr-14.C: Same.
	* testsuite/libgomp.c++/udr-15.C: Same.
	* testsuite/libgomp.c++/udr-16.C: Same.
	* testsuite/libgomp.c++/udr-17.C: Same.
	* testsuite/libgomp.c++/udr-18.C: Same.
	* testsuite/libgomp.c++/udr-19.C: Same.
	* testsuite/libgomp.c++/atomic-1.C: Remove dg-options "-O2".
	* testsuite/libgomp.c++/simd-1.C: Same.
	* testsuite/libgomp.c++/simd-2.C: Same.
	* testsuite/libgomp.c++/simd-3.C: Same.
	* testsuite/libgomp.c++/simd-4.C: Same.
	* testsuite/libgomp.c++/simd-5.C: Same.
	* testsuite/libgomp.c++/simd-6.C: Same.
	* testsuite/libgomp.c++/simd-7.C: Same.
	* testsuite/libgomp.c++/simd-8.C: Same.
	* testsuite/libgomp.c++/simd-9.C: Same.
	* testsuite/libgomp.c++/simd10.C: Same.
	* testsuite/libgomp.c++/simd11.C: Same.
	* testsuite/libgomp.c++/simd12.C: Same.
	* testsuite/libgomp.c++/simd13.C: Same.

From-SVN: r225181