RawSyscall is used in a variety of rather unsafe conditions, such as
after fork in forkAndExecInChild1. Disable race instrumentation to avoid
calling TSAN in unsafe conditions.
For #51087
Change-Id: I47c35e6f0768c77ddab99010ea0404c45ad2f1da
Reviewed-on: https://go-review.googlesource.com/c/go/+/402914
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>