Refactor HLL::Compiler.command_line so that compilers can more easily intercept argument processing.
Refactor HLL::Compiler.command_line so that compilers can more easily intercept argument processing.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp