Add param parloops-chunk-size

Add param parloops-chunk-size

2015-09-03  Tom de Vries  <tom@codesourcery.com>

	* doc/invoke.texi (parloops-chunk-size): Add item.
	* params.def (PARAM_PARLOOPS_CHUNK_SIZE): Add DEFPARAM.
	* tree-parloops.c: Include params.h.
	(create_parallel_loop): Set chunk-size of schedule of omp-for loop, if
	param parloops-chunk-size is used.

From-SVN: r227434