[cfe-dev] [analyzer] Extend constraint manager to be able to compare simple SymSymExprs

[Balázs Benics via cfe-dev]

The constraint manager has limited functionality in comparing symbols to
symbols.
Though, it wouldn't be too hard to make it a bit smarter.

I would like to implement the following logic in the constraint manager
class hierarchy:
Given `a` and `b` well-constrained symbols.
We should know that `a` less than `b` if the possible maximum value of `a`
is still less than the minimum value of `b`.
In other words: `maxOf(a) < minOf(b)  =>  a < b`

AFAIK `RangedConstraintManager` provides the interface to compare symbols
to constants.
The `RangeConstraintManager` class only implements that interface.

Should I extend the `RangedConstraintManager` interface to be able to
compare symbols to symbols?
Or, I could create another interface layer on top of `
RangedConstraintManager` interface to provide the necessary functions.

Which approach should I prefer?

Balazs
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