[turn off jumpoint optimization for now after grin devolving
John Meacham <john@repetae.net>**20061012005102] hunk ./Grin/Simplify.hs 502
-    caseHoist hexp v as' ty | grinPhase grin >= PostDevolve  = do
+    caseHoist hexp v as' ty | False && grinPhase grin >= PostDevolve  = do