[SMTChecker] Shortcut RationalNumber expressions

test/libsolidity/smtCheckerTests/simple/static_array.sol

@@ -7,4 +7,3 @@ contract C
 	int[3*1] x;
 }
 // ----
-// Warning: (153-156): Assertion checker does not yet implement this operator on non-integer types.

test/libsolidity/smtCheckerTests/types/rational_large_1.sol

@@ -0,0 +1,10 @@
+pragma experimental SMTChecker;
+contract c {
+	function f() public pure returns (uint) {
+		uint x = 8e130%9;
+		assert(x == 8);
+		assert(x != 8);
+	}
+}
+// ----
+// Warning: (128-142): Assertion violation happens here