Kai Germaschewski authored Jun 29, 2019 and Podhorszki, Norbert committed Jun 29, 2019

This simply renames `helper::CopyMemory` to `helper::CopyMemoryBlock` to
avoid a name clash with the `CopyMemory` defined in the MSVC build in #1485.

(cherry picked from commit 5f9bdb4e42a108ec19c2bf4034a3a2ddb0c5d951)