ARM64: Put all simulator trace on the same stream.

The simulator can trace to a specified stream, typically stderr or
stdout. However, several messages (such as ASM_LOCATIONs) were printed
only to stdout. As a result, they often ended up out of order with
respect to the instruction trace. This patch causes all simulator output
to go to the same stream.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/226503004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20580 ce2b1a6d-e550-0410-aec6-3dcde31c8c00