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Also check the flag in all code that possibly deduplicate instructions or needs to know whether instructions may have been deduplicated, so we can test this code in non-product builds by turning on the flag. Change-Id: Iefd1aa13a0f5a8a1cd51b547d554c9ae8e7410ac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134820 Commit-Queue: Teagan Strickland <sstrickl@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>