* gimple.h (gcc_gimple_checking_assert): New macro.
 	(gimple_set_def_ops, gimple_set_use_ops,
 	gimple_set_vuse, gimple_set_vdef,
 	gimple_omp_subcode, gimple_omp_set_subcode, gimple_ops, gimple_op,
 	gimple_op_ptr, gimple_op_ptr, gimple_set_op, gimple_bind_set_block,
 	gimple_asm_input_op, gimple_asm_input_op_ptr, gimple_asm_set_input_op,
 	gimple_asm_output_op, gimple_asm_output_op_ptr,
 	gimple_asm_set_output_op, gimple_asm_clobber_op, 
 	gimple_asm_set_clobber_op, gimple_asm_label_op,
 	gimple_asm_set_label_op, gimple_try_set_kind, gimple_try_catch_is_cleanup
 	gimple_try_set_catch_is_cleanup, gimple_phi_arg, 
 	gimple_switch_num_labels, gimple_switch_set_index, gimple_switch_label,
 	gimple_switch_set_label, gimple_omp_for_index, gimple_omp_for_index_ptr,
 	gimple_omp_for_set_index, gimple_omp_for_initial, gimple_omp_for_initial_ptr,
 	gimple_omp_for_set_initial, gimple_omp_for_final, gimple_omp_for_final_ptr,
 	gimple_omp_for_set_final, gimple_omp_for_incr, gimple_omp_for_incr_ptr,
 	gimple_omp_for_set_incr, gimple_omp_for_set_cond, gimple_omp_for_cond): Make
 	checking conditional with ENABLE_GIMPLE_CHECKING.
 	(gimple_phi_set_arg): Likewise; replace memcpy by assignment.

From-SVN: r160474