While debugging mysterious problem on Windows, one potential failure mode to
rule out was the possibility that streaming std::ostringstream <<
LLSDNotationStreamer(large_LLSD) might itself cause trouble -- even before
attempting to write to the LLProcess::WritePipe. The debugging code validated
that the correct length is being reported, and that deserializing the
resulting buffer produces equivalent LLSD. This code verified correct
operation, and so has been disabled, as it's expensive at runtime.