JS: Add test with FP

Author: asgerf

javascript/ql/test/query-tests/Declarations/MixedStaticInstanceThisAccess/MixedStaticInstanceThisAccess.expected

@@ -1,3 +1,4 @@
+| abstract.ts:6:9:6:17 | this.test | Access to static method $@ from instance method $@ is not possible through `this`. | abstract.ts:3:5:3:20 | static test() {} | test | abstract.ts:5:5:7:5 | method( ... K\\n    } | method |
 | instanceStatic.js:3:9:3:16 | this.baz | Access to instance method $@ from static method $@ is not possible through `this`. | instanceStatic.js:5:5:7:5 | baz(){\\n\\n    } | baz | instanceStatic.js:2:5:4:5 | static  ... K\\n    } | bar |
 | staticInstance.js:3:9:3:16 | this.baz | Access to static method $@ from instance method $@ is not possible through `this`. | staticInstance.js:5:5:6:5 | static baz(){\\n    } | baz | staticInstance.js:2:5:4:5 | bar(){\\n ... K\\n    } | bar |
 | tst.js:66:9:66:14 | this.f | Access to instance method $@ from static method $@ is not possible through `this`. | tst.js:60:5:62:5 | f() {\\n\\n    } | f | tst.js:65:5:67:5 | static  ... K\\n    } | test |

javascript/ql/test/query-tests/Declarations/MixedStaticInstanceThisAccess/abstract.ts

@@ -0,0 +1,8 @@
+abstract class Q {
+    abstract test();
+    static test() {}
+
+    method() {
+        this.test(); // OK
+    }
+}