Cop idea: short-circuit logical expressions quickly by evaluating variables first

[vlad-pisanov]

Whenever there is a conditional branch with a logical disjunction or conjunction, reorder the terms so that all variables are evaluated first to hopefully short-circuit the expression and avoid any expensive method calls.

# bad
if costly_method? && local_var
  ...
end

# good
if local_var && costly_method?
  ...
end