Support compiling Yul within StandardCompiler

test/cmdlineTests/standard_yul_optimized/input.json

@@ -0,0 +1,23 @@
+{
+	"language": "Yul",
+	"sources":
+	{
+		"A":
+		{
+			"content": "{ let x := mload(0) sstore(add(x, 0), 0) }"
+		}
+	},
+	"settings":
+	{
+		"optimizer": {
+			"enabled": true,
+			"details": {
+				"yul": true
+			}
+		},
+		"outputSelection":
+		{
+			"*": { "*": ["*"], "": [ "*" ] }
+		}
+	}
+}