Add abi.encode, abi.encodePacked, abi.encodeWithSelector and abi.encodeWithSignature.

libsolidity/ast/Types.h

@@ -914,6 +914,10 @@ public:
 		ObjectCreation, ///< array creation using new
 		Assert, ///< assert()
 		Require, ///< require()
+		ABIEncode,
+		ABIEncodePacked,
+		ABIEncodeWithSelector,
+		ABIEncodeWithSignature,
 		GasLeft ///< gasleft()
 	};
 
@@ -1049,7 +1053,7 @@ public:
 	ASTPointer<ASTString> documentation() const;
 
 	/// true iff arguments are to be padded to multiples of 32 bytes for external calls
-	bool padArguments() const { return !(m_kind == Kind::SHA3 || m_kind == Kind::SHA256 || m_kind == Kind::RIPEMD160); }
+	bool padArguments() const { return !(m_kind == Kind::SHA3 || m_kind == Kind::SHA256 || m_kind == Kind::RIPEMD160 || m_kind == Kind::ABIEncodePacked); }
 	bool takesArbitraryParameters() const { return m_arbitraryParameters; }
 	bool gasSet() const { return m_gasSet; }
 	bool valueSet() const { return m_valueSet; }
@@ -1207,7 +1211,7 @@ private:
 class MagicType: public Type
 {
 public:
-	enum class Kind { Block, Message, Transaction };
+	enum class Kind { Block, Message, Transaction, ABI };
 	virtual Category category() const override { return Category::Magic; }
 
 	explicit MagicType(Kind _kind): m_kind(_kind) {}