Merge pull request #6639 from ethereum/yul-require-assert

Yul generation of "require" and "assert"

libsolidity/codegen/YulUtilFunctions.h

@@ -62,6 +62,10 @@ public:
 	/// Pads with zeros and might write more than exactly length.
 	std::string copyToMemoryFunction(bool _fromCalldata);
 
+	// @returns the name of a function that has the equivalent logic of an
+	// `assert` or `require` call.
+	std::string requireOrAssertFunction(bool _assert, Type const* _messageType = nullptr);
+
 	/// @returns the name of a function that takes a (cleaned) value of the given value type and
 	/// left-aligns it, usually for use in non-padded encoding.
 	std::string leftAlignFunction(Type const& _type);