One part of this might change -- master contains some uses of
std::make_unique which Alexis might get rid of.

Change-Id: I40ae17f4e88920c4d60b79e1d4b117a7800fcd82
Reviewed-on: https://swiftshader-review.googlesource.com/c/23028Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>