Implement `super`.

test/libsolidity/semanticTests/intheritance/super_in_constructor.sol

@@ -30,6 +30,7 @@ contract D is B, C {
         return data;
     }
 }
-
+// ====
+// compileViaYul: also
 // ----
 // f() -> 15

test/libsolidity/semanticTests/intheritance/super_in_constructor_assignment.sol

@@ -0,0 +1,39 @@
+contract A {
+    function f() public virtual returns (uint256 r) {
+        return 1;
+    }
+}
+
+
+contract B is A {
+    function f() public virtual override returns (uint256 r) {
+        function() internal returns (uint) x = super.f;
+        return x() | 2;
+    }
+}
+
+
+contract C is A {
+    function f() public virtual override returns (uint256 r) {
+        function() internal returns (uint) x = super.f;
+        return x() | 4;
+    }
+}
+
+
+contract D is B, C {
+    uint256 data;
+
+    constructor() {
+        function() internal returns (uint) x = super.f;
+        data = x() | 8;
+    }
+
+    function f() public override (B, C) returns (uint256 r) {
+        return data;
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f() -> 15

test/libsolidity/semanticTests/intheritance/super_overload.sol

@@ -22,6 +22,8 @@ contract C is A, B {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // g() -> 10
 // h() -> 2

test/libsolidity/semanticTests/various/super.sol

@@ -25,5 +25,7 @@ contract D is B, C {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // f() -> 15

test/libsolidity/semanticTests/various/super_parentheses.sol

@@ -0,0 +1,31 @@
+contract A {
+    function f() public virtual returns (uint256 r) {
+        return 1;
+    }
+}
+
+
+contract B is A {
+    function f() public virtual override returns (uint256 r) {
+        return ((super).f)() | 2;
+    }
+}
+
+
+contract C is A {
+    function f() public virtual override returns (uint256 r) {
+        return ((super).f)() | 4;
+    }
+}
+
+
+contract D is B, C {
+    function f() public override(B, C) returns (uint256 r) {
+        return ((super).f)() | 8;
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// f() -> 15