Attempt to reduce extra instructions. Some line number instructions are not needed if we have the impl of those
instructions emit the line. This will end up yielding some benefits:

1. Less possible memory.
2. Less instr processing
   a. in interpreter
   b. in compiler passes
3. Allow contiguous homogeneous instrs (Trying to develop "super" instrs to reduce instrs more).

-e 1 with this first commit reduces instrs execution by 1200 instrs (from 495207 -> 494016) 0.3% less. This is a tiny number but this is also only affecting one-time code.

Update: with my recent merges of implicit prologue instr removal this is down to 449335 instrs.