[release-branch.go1.16] cmd/go: forward the MallocNanoZone variable to script tests
For #49138
Updates #49723
Fixes #49728
Change-Id: Ia93130fdc042a1e2107be95cccd7e7eeaa909a87
Reviewed-on: https://go-review.googlesource.com/c/go/+/366254
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit
189b4a2f428be7264db76e5275c96d98b847383b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/366258
TryBot-Result: Go Bot <gobot@golang.org>