[SMTChecker] Support address type conversion with literals

test/libsolidity/smtCheckerTests/modifiers/modifier_inline_function_inside_branch.sol

@@ -17,5 +17,3 @@ contract C
 	}
 }
 // ----
-// Warning 5084: (205-215): Type conversion is not yet fully supported and might yield false positives.
-// Warning 5084: (205-215): Type conversion is not yet fully supported and might yield false positives.

test/libsolidity/smtCheckerTests/typecast/address_literal.sol

@@ -0,0 +1,25 @@
+pragma experimental SMTChecker;
+
+contract C {
+  address x; // We know that this is "zero initialised".
+  function f() public view {
+    address a = address(0);
+    assert(x == address(0));
+    assert(x == a);
+  }
+
+  function g() public pure {
+    address a = address(0);
+    address b = address(1);
+    address c = address(0);
+    address d = a;
+    address e = address(0x12345678);
+    assert(c == d);
+    assert(a == c);
+    assert(e == address(305419896));
+    // This is untrue.
+    assert(a == b);
+  }
+}
+// ----
+// Warning 6328: (487-501): Assertion violation happens here.

test/libsolidity/smtCheckerTests/types/tuple_extra_parens_7.sol

@@ -11,4 +11,3 @@ contract C {
 	}
 }
 // ----
-// Warning 5084: (142-152): Type conversion is not yet fully supported and might yield false positives.