[gardening] Restore timout multiplier in test runner for linux-arm64 The timeout multipiler for linux-arm64 was originally 4, then lowered to 1 (see [0]), then increased again to 2 (see [1]). Though it seems that service tests are still flakily timing out, so let's try restoring the original multilier. [0] https://dart-review.googlesource.com/c/sdk/+/306662 [1] https://dart-review.googlesource.com/c/sdk/+/307972 Also special case `ia32` in timeout calculations due to not using an AppJIT trained `kernel-isolate` snapshot and therefore being very slow, especially in ia32-debug mode. Issue https://github.com/dart-lang/sdk/issues/52589 TEST=ci Change-Id: Iab8c768866aec9e77bb83c7a3242cc5de8fb4e2f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/312905 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Slava Egorov <vegorov@google.com>
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