runtime: disable windowed Smhasher test on 32-bit systems
This test tends to be flaky on 32-bit systems.
There's not enough bits in the hash output, so we
expect a nontrivial number of collisions, and it is
often quite a bit higher than expected.
Fixes #43130
Change-Id: If35413b7c45eed778a08b834dacf98009ceca840
Reviewed-on: https://go-review.googlesource.com/c/go/+/402456
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Keith Randall <khr@google.com>