The existing implementation of Result with tagged pointers was not able
to handle constant pointers for the result. This is required in
follow-up CLs to return internal formats in a ResultOrError.
This CL extracts the tagged pointer logic out of Result<T*, E*> so it
can be shared with Result<const T*, E*>.
Tests are also added to cover Result<const T*, E*>.
BUG=dawn:128
Change-Id: Id19ae8e1153bcfcaf94d95ac314faf2b23af6f91
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/9100
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Corentin Wallez