test: disable the live test on riscv64
test: disable the live test on riscv64

This test expects that open-coded defers are enabled, which is not currently
the case on riscv64.

Updates issue #27532 and #36786.

Change-Id: I94bb558c5b0734b4cfe5ae12873be81026009bcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/216777
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

CAFxX/go,nawawi/go,nawawi/go,golang/go,CAFxX/go,nawawi/go,akutz/go,golang/go,akutz/go,akutz/go,CAFxX/go,akutz/go,golang/go,cloudflare/go,cloudflare/go,CAFxX/go,CAFxX/go,nawawi/go,nawawi/go,cloudflare/go,nawawi/go,akutz/go,cloudflare/go,nawawi/go,cloudflare/go,cloudflare/go,CAFxX/go,CAFxX/go,akutz/go,golang/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,golang/go,golang/go,akutz/go,golang/go,akutz/go,cloudflare/go