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":
+		{
+			"*": { "*": ["*"], "": [ "*" ] }
+		}
+	}
+}

test/cmdlineTests/standard_yul_optimized/output.json

@@ -0,0 +1 @@
+{"contracts":{"A":{"object":{"evm":{"assembly":"    /* \"A\":17:18   */\n  0x00\n  0x00\n    /* \"A\":11:19   */\n  mload\n    /* \"A\":20:40   */\n  sstore\n","bytecode":{"linkReferences":{},"object":"600060005155","opcodes":"PUSH1 0x0 PUSH1 0x0 MLOAD SSTORE ","sourceMap":""}},"ir":"object \"object\" {\n    code {\n        let x := mload(0)\n        sstore(add(x, 0), 0)\n    }\n}\n","irOptimized":"object \"object\" {\n    code {\n        sstore(mload(0), 0)\n    }\n}\n"}}}}