[perl5db] Refactoring.
Add explicit returns.
Got rid of a $1 reference.
Extract a subroutine.
[perl5db] Extract some subroutines.
Extract _cmd_l_range .
More refactoring.
Extract a subroutine.
Extract _cmd_l_calc_initial_end_and_i .
Got rid of passing $cmd to subs that don't use it.
[perl5db] Extract.
Rename vars to remove ambiguity.
Remove a redundant line.
Remove an unused parameter.
Start refactoring cmd_L.
Some refactoring.
Extract some duplicate code into a closure.
Extract a subroutine.
Remove a no-longer needed comment.
Add empty lines and an explicit return.