Add fflush after writing to log (Issue 868).

BUG=868

Review URL: http://codereview.chromium.org/3605001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5565 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/log-utils.h

@@ -132,6 +132,7 @@ class Log : public AllStatic {
     size_t rv = fwrite(msg, 1, length, output_handle_);
     ASSERT(static_cast<size_t>(length) == rv);
     USE(rv);
+    fflush(output_handle_);
     return length;
   }