CodeQL library for C#
codeql/csharp-all 1.0.3-dev (changelog, source)

Member predicate RelationalOperation::getGreaterOperand

Gets the operand on the “greater” (or “greater-or-equal”) side of this relational expression, that is, the side that is larger if the overall expression evaluates to true; for example on x <= 20 this is the 20, and on y > 0 it is y.

Expr getGreaterOperand()