stats: Output new-world stats before legacy stats
stats: Output new-world stats before legacy stats

Now that global stats have been converted to new-style stats, it's
desirable to output them before legacy stats. This ensures that global
statistics (e.g., host_seconds) show up first in the stat file.

Change-Id: Ib099d0152a6612ebbadd234c27f2f3448aef1260
Signed-off-by: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35617
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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