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With Xcode 11.4, the arm64e slice of XCTRunner is removed from the
binary when creating the XCUITest runner application. Not doing it
may prevents running the application on a device, so replicate this.

Bug: none
Change-Id: I25925ac7ed20150bb2ef4cffa01e64f8ad9d4e1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127111
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754981}