[infra] allow to specify arch twice. A recent change: https://dart-review.googlesource.com/c/sdk/+/333842 fixed a check in the test runner. The check fails when a flag is provided to test.py but it is also implied by the configuration name. However, The web macos bots currently need to specify the arch flag, even though it is implied by the named configuration. Without doing so the sharding infrastructure seems to fail to assign the correct architecture for the spawn bots. This CL temporarily allows to continue specifying this flag to keep the bots running. Ideally we should follow up with a infrastructure fix to ensure this flag is not needed in the future. This is being tracked in https://github.com/dart-lang/sdk/issues/53948 Change-Id: Ifba6a8924cbca9f3aca38933113abb168ff405d4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/333705 Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Sigmund Cherem <sigmund@google.com>
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