Increase test timeout on slow architectures.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/24037002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16582 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/run-tests.py

@@ -293,7 +293,7 @@ def Execute(arch, mode, args, options, suites, workspace):
   if timeout == -1:
     # Simulators are slow, therefore allow a longer default timeout.
     if arch in SLOW_ARCHS:
-      timeout = 2 * TIMEOUT_DEFAULT;
+      timeout = 3 * TIMEOUT_DEFAULT;
     else:
       timeout = TIMEOUT_DEFAULT;