Add and update tests

test/libsolidity/smtCheckerTests/abi/abi_encode_array_slice.sol

@@ -0,0 +1,31 @@
+pragma experimental SMTChecker;
+contract C {
+	function abiEncodeSlice(bytes calldata data) external pure {
+		bytes memory b1 = abi.encode(data);
+		bytes memory b2 = abi.encode(data[0:]);
+		// should hold but the engine cannot infer that data is fully equals data[0:] because each index is assigned separately
+		assert(b1.length == b2.length); // fails for now
+
+		// Disabled because of Spacer nondeterminism
+		//bytes memory b3 = abi.encode(data[:data.length]);
+		// should hold but the engine cannot infer that data is fully equals data[:data.length] because each index is assigned separately
+		//assert(b1.length == b3.length); // fails for now
+
+		bytes memory b4 = abi.encode(data[5:10]);
+		assert(b1.length == b4.length); // should fail
+
+		uint x = 5;
+		uint y = 10;
+		bytes memory b5 = abi.encode(data[x:y]);
+		// should hold but the engine cannot infer that data[5:10] is fully equals data[x:y] because each index is assigned separately
+		assert(b1.length == b5.length); // fails for now
+	}
+}
+// ----
+// Warning 6328: (311-341): CHC: Assertion violation happens here.
+// Warning 1218: (694-724): CHC: Error trying to invoke SMT solver.
+// Warning 6328: (694-724): CHC: Assertion violation might happen here.
+// Warning 1218: (945-975): CHC: Error trying to invoke SMT solver.
+// Warning 6328: (945-975): CHC: Assertion violation might happen here.
+// Warning 4661: (694-724): BMC: Assertion violation happens here.
+// Warning 4661: (945-975): BMC: Assertion violation happens here.