Revert "add debug info generation to the compiler."

This reverts commit f1edb58d9ca8eaaedea8347115d884819808029b.
more specop changes.  EJS_DEFINE_CLASS takes one arg now, the class name.  this means we need to capitalize all references to specops
add support for --debug-after <passname> to print out AST/IR after that pass.  add Map polyfill (for the features we use, anyway), and fix class desugaring so that class1.js and class2.js now pass.