This reduced the total time spent in LoadToNative3To4 by 10% in our
micro-benchmark.

Test: passed the CQ dry run.
Bug: b/182513949
Change-Id: I5d1b1975f64e5b08bd0e65abc8f94fe62ef54321
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2752347
Commit-Queue: Pujun Lun <lunpujun@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>