runtime: skip TestArenaCollision if we run out of hints This seems failure mode seems to have become more common on Windows. I suspect the randomized heap base address has something to do with it, but I'm not 100% sure. What's definitely certain is that we're running out of hints, since we're seeing failures that mheap_.arenaHints is nil and GetNextArenaHint doesn't actually check that. At the very least we can check that and skip. We know that in this case there's not that much we can do. Fixes #76566. Change-Id: I8ccc8994806b6c95e3157eb296b09705637564b3 Reviewed-on: https://go-review.googlesource.com/c/go/+/726527 Reviewed-by: Michael Pratt <mpratt@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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