reflect: enable allocation tests

They were disabled due to the lack of escape analysis. Now that
we have escape analysis, unskip these tests.

Change-Id: I79bf1e00342cf3d8969c9135c1ea5f7d3cb48f4d
Reviewed-on: https://go-review.googlesource.com/86248
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed