Make fopenmp an LTO option

2015-01-23  Tom de Vries  <tom@codesourcery.com>

	PR libgomp/64707
	* lto-opts.c (lto_write_options): Output non-explicit conservative
	-fno-openmp.
	* lto-wrapper.c (merge_and_complain): Handle merging -fopenmp.
	(append_compiler_options): Pass -fopenmp through.

	* c.opt (fopenmp): Mark as LTO option.

	* lang.opt (fopenmp): Mark as LTO option.

	* testsuite/libgomp.c/target-9.c: Add -ftree-parallelize-loops=0 to
	dg-options.

From-SVN: r220037