Checkpoint:
  Add a debug version of the spidermonkey shell to support more robust performance tests
  Add Verbatim.TagJSExpression and JSIL.Shell.TagObject for use in the debug spidermonkey shell
  Move some performance tests into their own folder and fixture
  Make JSIL.Host.runLater work in the shell (but you have to flush the queue manually)
Checkpoint:
  Extracts type information from test output for expressions tagged with JSIL.Profiling.TagJSExpression
Split the performance tests into two fixtures to avoid the performance penalty of inferflags
Cleanup performance analysis support.
Make the pointer method test actually assert on what it cares about.