Fix InlineArrayType::componentsCommonMobileType function

test/libsolidity/semanticTests/array/indexAccess/inline_array_index_access_ints.sol

@@ -2,9 +2,41 @@ contract C {
     function f() public returns (uint256) {
         return ([1, 2, 3, 4][2]);
     }
+
+    function g() public returns (uint256) {
+        return [7][0];
+    }
+
+    function h(uint i) public returns (int256) {
+        return [1, -1][i];
+    }
+
+    function k(uint i) public returns (int256) {
+        return [-2, 2][i];
+    }
+
+    function l(uint i) public returns (int256) {
+        int8 a = -2;
+        uint8 b = 3;
+        return [1, a, b, -1, get()][i];
+    }
+
+    function get() internal returns (int) {
+        return -2;
+    }
 }
 
 // ====
 // compileToEwasm: also
 // ----
 // f() -> 3
+// g() -> 7
+// h(uint256): 0 -> 1
+// h(uint256): 1 -> -1
+// k(uint256): 0 -> -2
+// k(uint256): 1 -> 2
+// l(uint256): 0 -> 1
+// l(uint256): 1 -> -2
+// l(uint256): 2 -> 3
+// l(uint256): 3 -> -1
+// l(uint256): 4 -> -2