testing: update helperNames just before checking it
parent's helperNames has not been set when frameSkip called, moving
helperNames initilazing to frameSkip.
Fixes #44887
Change-Id: I5107c5951033e5e47d1ac441eac3ba5344a7bdc0
GitHub-Last-Rev:
44b90b2e2eeca8e2bb4a2084ec6fdd279c88f76d
GitHub-Pull-Request: golang/go#45071
Reviewed-on: https://go-review.googlesource.com/c/go/+/302469
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>