PR c++/69826
	* c-pragma.c (c_pp_lookup_pragma): Handle PRAGMA_CILK_GRAINSIZE.
	(init_pragma): Register PRAGMA_CILK_GRAINSIZE even for
	flag_preprocess_only.

	* c-c++-common/cilk-plus/CK/pr69826-1.c: New test.
	* c-c++-common/cilk-plus/CK/pr69826-2.c: New test.

From-SVN: r233571