libgo: uncomment trace.Stop() call in testing package

Fix up the testing package to insure that execution traces
work properly (e.g. "-test.trace=<XXX>" command line option). The
call to stop tracing and emit the output file was stubbed out.

Change-Id: I205789804c15eaa356658780a699275bf29a206b
Reviewed-on: https://go-review.googlesource.com/128275
Reviewed-by: Ian Lance Taylor <iant@golang.org>
1 file changed