trans-stmt.c (gfc_trans_lock_unlock): Implement -fcoarray=lib version; reject not-yet-implemented variants.

2015-04-10  Tobias Burnus  <burnus@net-b.de>

gcc/fortran/
	* trans-stmt.c (gfc_trans_lock_unlock): Implement -fcoarray=lib
	version; reject not-yet-implemented variants.
	* trans-types.c (gfc_get_derived_type): For lock_type with
	-fcoarray=lib, use a void pointer as type.
	* trans.c (gfc_allocate_using_lib, gfc_allocate_allocatable):
	Handle lock_type with -fcoarray=lib.

gcc/testsuite/
	* gfortran.dg/coarray_lock_6.f90: New.
	* gfortran.dg/coarray_lock_7.f90: New.
	* gfortran.dg/coarray/lock_2.f90: New.

From-SVN: r221973