Add ABIEncoderV2 cleanup tests.

test/libsolidity/semanticTests/abiEncoderV2/cleanup/address.sol

@@ -0,0 +1,31 @@
+pragma experimental ABIEncoderV2;
+
+contract C {
+    function g(address x) external pure returns (uint256 r) {
+        assembly { r := x }
+    }
+    function f(uint256 a) external view returns (uint256) {
+        address x;
+        assembly { x := a }
+        return this.g(x);
+    }
+}
+// ----
+// f(uint256): 0 -> 0
+// g(address): 0 -> 0 # test validation as well as sanity check #
+// f(uint256): 1 -> 1
+// g(address): 1 -> 1
+// f(uint256): 2 -> 2
+// g(address): 2 -> 2
+// f(uint256): 0xabcdef0123456789abcdef0123456789abcdefff -> 0xabcdef0123456789abcdef0123456789abcdefff
+// g(address): 0xabcdef0123456789abcdef0123456789abcdefff -> 0xabcdef0123456789abcdef0123456789abcdefff
+// f(uint256): 0xffffffffffffffffffffffffffffffffffffffff -> 0xffffffffffffffffffffffffffffffffffffffff
+// g(address): 0xffffffffffffffffffffffffffffffffffffffff -> 0xffffffffffffffffffffffffffffffffffffffff
+// f(uint256): 0x010000000000000000000000000000000000000000 -> 0
+// g(address): 0x010000000000000000000000000000000000000000 -> FAILURE
+// f(uint256): 0x01abcdef0123456789abcdef0123456789abcdefff -> 0xabcdef0123456789abcdef0123456789abcdefff
+// g(address): 0x01abcdef0123456789abcdef0123456789abcdefff -> FAILURE
+// f(uint256): 0x01ffffffffffffffffffffffffffffffffffffffff -> 0xffffffffffffffffffffffffffffffffffffffff
+// g(address): 0x01ffffffffffffffffffffffffffffffffffffffff -> FAILURE
+// f(uint256): -1 -> 0xffffffffffffffffffffffffffffffffffffffff
+// g(address): -1 -> FAILURE