[SYCL] Enable discard_events feature tests for L0 (#1132)

Author: againull

SYCL/DiscardEvents/discard_events_accessors.cpp

@@ -1,7 +1,3 @@
-// FIXME unsupported on level_zero until L0 Plugin support becomes available for
-// discard_queue_events
-// UNSUPPORTED: level_zero
-//
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
 //
 // RUN: env SYCL_PI_TRACE=2 %CPU_RUN_PLACEHOLDER %t.out &> %t.txt || true

SYCL/DiscardEvents/discard_events_using_assert_ndebug.cpp

@@ -1,7 +1,3 @@
-// FIXME unsupported on level_zero until L0 Plugin support becomes available for
-// discard_queue_events
-// UNSUPPORTED: level_zero
-//
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -DNDEBUG -o %t.out
 //
 // RUN: env SYCL_PI_TRACE=2 %CPU_RUN_PLACEHOLDER %t.out &> %t.txt

SYCL/DiscardEvents/discard_events_usm.cpp

@@ -1,7 +1,5 @@
-// FIXME unsupported on level_zero until L0 Plugin support becomes available for
-// discard_queue_events
 // FIXME unsupported in HIP plugin
-// UNSUPPORTED: level_zero || hip
+// UNSUPPORTED: hip
 //
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
 //