Initial introduction of array slices with partial implementation for dynamic calldata arrays.

test/libsolidity/syntaxTests/specialFunctions/abidecode/abi_decode_invalid_arg_type.sol

@@ -4,5 +4,5 @@ contract C {
   }
 }
 // ----
-// TypeError: (57-61): Invalid type for argument in function call. Invalid implicit conversion from type(uint256) to bytes memory requested.
+// TypeError: (57-61): The first argument to "abi.decode" must be implicitly convertible to bytes memory or bytes calldata, but is of type type(uint256).
 // TypeError: (63-67): The second argument to "abi.decode" has to be a tuple of types.