runtime: don't run TestStackGrowth in parallel with other tests
This test calls runtime.GC quite a number of times. GC is a global
operation. To reduce interference with other tests, don't run this
test in parallel with other tests.
May fix #57601.
Change-Id: I6efadb62c4dada37a927455f5c6cd98cafb88aaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/492715
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>