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Both ios-device and ios-device-xcode-clang seem to have disk space issues. This
is an attempt to reduce the disk space required for compilation on bots.

Bug: 895761
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Iea34c089b780ecb9231ab2fc9031ae9f89ab998f
Reviewed-on: https://chromium-review.googlesource.com/c/1285770Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Sergey Berezin <sergeyberezin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600433}