Add hasHexPrefix() to AST::Literal

libsolidity/ast/AST.h

@@ -1590,6 +1590,9 @@ public:
 
 	SubDenomination subDenomination() const { return m_subDenomination; }
 
+	/// @returns true if this is a number with a hex prefix.
+	bool hasHexPrefix() const;
+
 	/// @returns true if this looks like a checksummed address.
 	bool looksLikeAddress() const;
 	/// @returns true if it passes the address checksum test.