Fix ICE on conditions with tuples of rationals

test/libsolidity/smtCheckerTests/operators/tuple_rationals_conditional.sol

@@ -0,0 +1,11 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f(bool x) public pure {
+		(uint a, uint b) = x ? (10000000001, 2) : (3, 4);
+		assert(a != 0);
+		assert(b != 0);
+		assert(a % 2 == 1);
+		assert(b % 2 == 0);
+	}
+}