[OpenMP] Refactored the function `DeviceTy::data_exchange`

Authored by tianshilei1992 on Aug 19 2020, 1:07 PM.


[OpenMP] Refactored the function DeviceTy::data_exchange

This patch contains the following changes:

  1. Renamed the function DeviceTy::data_exchange to DeviceTy::dataExchange;
  2. Changed the second argument DeviceTy DstDev to DeviceTy &DstDev;
  3. Renamed the last argument.

Reviewed By: ye-luo

Differential Revision: https://reviews.llvm.org/D86238