target-supports.exp (check_effective_target_keeps_null_pointer_checks): New function.

target-supports.exp (check_effective_target_keeps_null_pointer_checks): New function.

* lib/target-supports.exp(check_effective_target_keeps_null_pointer_checks): New function.
* gcc.dg/tree-ssa/20030730-1.c: Use keeps_null_pointer_checks to determine correct test response.
* gcc.dg/tree-ssa/20030730-2.c: Ditto.
* gcc.dg/tree-ssa/pr20701.c: Ditto.
* gcc.dg/tree-ssa/pr20702.c: Ditto.
* gcc.dg/tree-ssa/pr21086.c: Ditto.
* gcc.dg/tree-ssa/vrp02.c:: Ditto.
* gcc.dg/tree-ssa/vrp07.c:: Ditto.
* gcc.dg/tree-ssa/vrp08.c:: Ditto.

From-SVN: r136970