ComparisonToBoolean with Bool unions

[Blacksmoke16]

Given the following code:

val = false || 10

if val == true
  pp "TRUE"
else
  pp val.to_s
end

This currently results in:

[W] Lint/ComparisonToBoolean: Comparison to a boolean is pointless
> if val == true
     ^---------^

However I think in this case it's a false positive since val : Bool | Int32, in which case you need the explicit comparison in order to not enter the TRUE block if val happens to be any number.

[Sija]

There's nothing that can be done here, short of introducing semantic analysis.

[Sija]

Duplicate of #171