[SYCL][HIP][libclc] Fix wrong address spaces for HIP (#4966)

Fixes wrong address spaces for `event_t`. It should be private, but in SYCL it was defaulting to generic. On the other hand in libclc pointer to `event_t` was private, while it should be generic. (We don't see similar issues on NVPTX, as there private address space is in fact implemented as generic in IR).

Change to test suite: intel/llvm-test-suite#570

Author: t4c1

clang/lib/Basic/Targets/AMDGPU.h

@@ -328,6 +328,8 @@ class LLVM_LIBRARY_VISIBILITY AMDGPUTargetInfo final : public TargetInfo {
     case OCLTK_Queue:
     case OCLTK_ReserveID:
       return LangAS::opencl_global;
+    case OCLTK_Event:
+      return LangAS::opencl_private;
 
     default:
       return TargetInfo::getOpenCLTypeAddrSpace(TK);

libclc/amdgcn-amdhsa/libspirv/SOURCES

@@ -56,3 +56,4 @@ workitem/get_sub_group_id.cl
 workitem/get_sub_group_local_id.cl
 workitem/get_sub_group_size.cl
 misc/sub_group_shuffle.cl
+async/wait_group_events.cl

libclc/amdgcn-amdhsa/libspirv/async/wait_group_events.cl

@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <spirv/spirv.h>
+
+_CLC_DEF void _Z23__spirv_GroupWaitEventsjiP9ocl_event(unsigned int scope,
+                                                    int num_events,
+                                                    event_t __attribute__((address_space(0)))* event_list) {
+  __spirv_ControlBarrier(scope, Workgroup, SequentiallyConsistent);
+}
+
+