[cfe-commits] Refactor BasicConstraintManager

[Ben Laurie]

My new RangeConstraintManager shares a lot of code with
BasicConstraintManager. This patch refactors BasicConstraintManager to
inherit the shared code from SimpleConstraintManager. No code changes
have been made, stuff has just been moved around.

It also constifies getSymVal, since non-constness prevents its use in isEqual.
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