[Sol->Yul] Implementing push for nested storage arrays and storage arrays of structs.

test/libsolidity/semanticTests/array/array_push_nested.sol

@@ -0,0 +1,17 @@
+contract C {
+    uint8 b = 23;
+    uint120[][] s;
+    uint8 a = 17;
+    function f() public {
+        s.push();
+        assert(s.length == 1);
+        assert(s[0].length == 0);
+        s[0].push();
+        assert(s[0].length == 1);
+        assert(s[0][0] == 0);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f() ->

test/libsolidity/semanticTests/array/dynamic_arrays_in_storage.sol

@@ -39,6 +39,8 @@ contract c {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // getLengths() -> 0, 0
 // setLengths(uint256,uint256): 48, 49 ->

test/libsolidity/semanticTests/array/push_no_args_2d.sol

@@ -24,6 +24,8 @@ contract C {
 		array2d.push().push() = value;
 	}
 }
+// ====
+// compileViaYul: also
 // ----
 // l() -> 0
 // f(uint256,uint256): 42, 64 ->