Use a StableSort() to ensure the output is the same between different
versions of golang.
Change-Id: Ic81688d189ce62816ba0aefddcef607b76415a5d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/110361
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Ben Clayton <bclayton@google.com>