Add libgomp.oacc-c-c++-common/f-asyncwait-{1,2,3}.c

Add libgomp.oacc-c-c++-common/f-asyncwait-{1,2,3}.c

2017-11-15  Tom de Vries  <tom@codesourcery.com>

	* testsuite/libgomp.oacc-c-c++-common/f-asyncwait-1.c: New test, copied
	from asyncwait-1.f90.  Rewrite into C.  Rewrite from float to int.
	* testsuite/libgomp.oacc-c-c++-common/f-asyncwait-2.c: New test, copied
	from asyncwait-2.f90.  Rewrite into C.  Rewrite from float to int.
	* testsuite/libgomp.oacc-c-c++-common/f-asyncwait-3.c: New test, copied
	from asyncwait-3.f90.  Rewrite into C.  Rewrite from float to int.

From-SVN: r254769