runtime: disable allocations test on gccgo

It turns out that testing.AllocsPerRun has not been producing correct
results with the current gccgo memory allocator.  When we update to
the Go 1.8 memory allocator, testing.AllocsPerRun will work again, and
these tests will fail due to lack of escape analysis.

Change-Id: I656404f6dfae88386de2dd0efe362abc0d92b7cf
Reviewed-on: https://go-review.googlesource.com/40703
Reviewed-by: Than McIntosh <thanm@google.com>
1 file changed