[OPENMP]Make lambda mapping follow reqs for PTR_AND_OBJ mapping.

[ABataev]

Summary

The base pointer for the lambda mapping must point to the lambda capture
placement and pointer must point to the captured variable itself. Patch
fixes this problem.

[gtbercea]

LG

openmp/trunk/libomptarget/src/omptarget.cpp

if (!(arg_types[i] & OMP_TGT_MAPTYPE_TARGET_PARAM)) {
       if (isLambdaMapping(arg_types[i])) {
         assert((arg_types[i] & OMP_TGT_MAPTYPE_MEMBER_OF) &&
                "PTR_AND_OBJ must be also MEMBER_OF.");
         unsigned idx = member_of(arg_types[i]);
         int tgtIdx = tgtArgsPositions[idx];
         assert(tgtIdx != -1 && "Base address must be translated already.");
         // The parent lambda must be processed already and it must be the last
         // in tgt_args and tgt_offsets arrays.
-        void *HstPtrBegin = args[i];
-        void *HstPtrBase = args_base[i];
+        void *HstPtrVal = args[i];
+        void *HstPtrBegin = args_base[i];
+        void *HstPtrBase = args[idx];
         bool IsLast; // unused.
         void *TgtPtrBase =
             (void *)((intptr_t)tgt_args[tgtIdx] + tgt_offsets[tgtIdx]);
         DP("Parent lambda base " DPxMOD "\n", DPxPTR(TgtPtrBase));
         uint64_t Delta = (uint64_t)HstPtrBegin - (uint64_t)HstPtrBase;
         void *TgtPtrBegin = (void *)((uintptr_t)TgtPtrBase + Delta);
-        void *Pointer_TgtPtrBegin = Device.getTgtPtrBegin(
-            *(void **)HstPtrBegin, arg_sizes[i], IsLast, false);
+        void *Pointer_TgtPtrBegin =
+            Device.getTgtPtrBegin(HstPtrVal, arg_sizes[i], IsLast, false);
         if (!Pointer_TgtPtrBegin) {
           DP("No lambda captured variable mapped (" DPxMOD ") - ignored\n",
-             DPxPTR(*(void **)HstPtrBegin));
+             DPxPTR(HstPtrVal));
           continue;
         }
         DP("Update lambda reference (" DPxMOD ") -> [" DPxMOD "]\n",
            DPxPTR(Pointer_TgtPtrBegin), DPxPTR(TgtPtrBegin));
         int rt = Device.data_submit(TgtPtrBegin, &Pointer_TgtPtrBegin,
                                     sizeof(void *));
         if (rt != OFFLOAD_SUCCESS) {
           DP("Copying data to device failed.\n");