[SYCL] Remove host run and dependencies from SYCL/DiscardEvents tests (#1204)

This commit removes the host run and any assumptions and operations
related to the host device from the tests in SYCL/DiscardEvents.

Signed-off-by: Larsen, Steffen <[email protected]>
Co-authored-by: Sachkov, Alexey <[email protected]>

Author: steffenlarsen

SYCL/DiscardEvents/invalid_event.cpp

@@ -2,7 +2,6 @@
 // UNSUPPORTED: hip, (opencl && accelerator)
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
 //
-// RUN: %HOST_RUN_PLACEHOLDER %t.out
 // RUN: %CPU_RUN_PLACEHOLDER %t.out
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 // RUN: %ACC_RUN_PLACEHOLDER %t.out

SYCL/DiscardEvents/invalid_event_exceptions.cpp

@@ -1,6 +1,5 @@
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
 //
-// RUN: %HOST_RUN_PLACEHOLDER %t.out
 // RUN: %CPU_RUN_PLACEHOLDER %t.out
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 // RUN: %ACC_RUN_PLACEHOLDER %t.out