Disallow using overloaded functions as literal suffixes

test/libsolidity/semanticTests/literalSuffixes/overloaded_suffix_in_abi_encode.sol

@@ -1,17 +0,0 @@
-function suffix(uint x) pure suffix returns (uint) { return x; }
-function suffix(bool x) pure suffix returns (bool) { return x; }
-function suffix(address x) pure suffix returns (address) { return x; }
-function suffix(string memory x) pure suffix returns (string memory) { return x; }
-
-contract C {
-    function run() public returns (bytes memory) {
-        return abi.encode(
-            42 suffix,
-            true suffix,
-            0x1234567890123456789012345678901234567890 suffix,
-            "a" suffix
-        );
-    }
-}
-// ----
-// run() -> 0x20, 0xc0, 0x2a, 1, 0x1234567890123456789012345678901234567890, 0x80, 1, "a"