When a uniform of struct type was redeclared, the arrayness information
was not transferred.

Bug: chromium:1204861
Change-Id: Ic3f461a4aa349a73bc48568ee14b5418f0556238
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2889599
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>