[OpenMP][libomptarget] Fix AsyncInfoTy object in omp_target_memcpy

[kevinsala]

Summary

The AsyncInfoTy should be created in the same device as the async operation will be issued. In omp_target_memcpy, the AsyncInfoTy for the host to destination device transfer was created referring to the source device.

[tianshilei1992]

Thanks for the fix! LG.

[kevinsala]

Thanks for reviewing it @tianshilei1992. Since I don't have access to the repo, I'd appreciate if you could commit the patch for me. Thanks!

openmp/libomptarget/src/api.cpp

if (SrcDevice == omp_get_initial_device() &&
     }
 
     void *Buffer = malloc(Length);
     {
       AsyncInfoTy AsyncInfo(SrcDev);
       Rc = SrcDev.retrieveData(Buffer, SrcAddr, Length, AsyncInfo);
     }
     if (Rc == OFFLOAD_SUCCESS) {
-      AsyncInfoTy AsyncInfo(SrcDev);
+      AsyncInfoTy AsyncInfo(DstDev);
       Rc = DstDev.submitData(DstAddr, Buffer, Length, AsyncInfo);
     }
     free(Buffer);
   }
 
   DP("omp_target_memcpy returns %d\n", Rc);
   return Rc;
 }