ARM64: Put all simulator trace on the same stream.

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

Committed: https://code.google.com/p/v8/source/detail?r=20580

[ulan, 2014-04-08 13:21:39]

lgtm

[jbramley, 2014-04-08 13:27:18]

Committed patchset #1 manually as r20580 (presubmit successful).