Drop std::move() calls in places where there's no actual moving
happing, and only the "bugprone-use-after-move" clang-tidy
warning is triggered.

Bug: chromium:1122844
Change-Id: I692da5af4f96305f09008d1c7fd18f9be7f6273f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2401241
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>