add IRBuilder.createICmpUGE
the alternate is optional in an if statement
move default parameter handling (and initial stores from parameters to locals) into an earlier pass.  this fixes problems caused by default expressions not being dealt with during compute-free and related machinery.
we weren't parsing capitalized hex literals properly.  this is a terrible fix but fixes the issue.
add a test for hex literals with capital hex digits
fix handler args so --debug-after works again