ARM64: fix simulator constructor

BUG=
R=ulan@chromium.org, bmeurer@chromium.org

Review URL: https://codereview.chromium.org/226023002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20517 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm64/simulator-arm64.cc

@@ -392,7 +392,7 @@ Simulator::Simulator()
       last_debugger_input_(NULL),
       log_parameters_(NO_PARAM),
       isolate_(NULL) {
-  Init(NULL);
+  Init(stdout);
   CHECK(!FLAG_trace_sim && !FLAG_log_instruction_stats);
 }