Add settings.viaIR to standard json

libsolidity/interface/StandardCompiler.h

@@ -72,6 +72,7 @@ private:
 		CompilerStack::MetadataHash metadataHash = CompilerStack::MetadataHash::IPFS;
 		Json::Value outputSelection;
 		ModelCheckerSettings modelCheckerSettings = ModelCheckerSettings{};
+		bool viaIR = false;
 	};
 
 	/// Parses the input json (and potentially invokes the read callback) and either returns