JS: create new common directory for all generated tests, migrate several tests there

js/js.translator/testData/box/inline/incrementProperty.kt

@@ -0,0 +1,23 @@
+package foo
+
+// CHECK_NOT_CALLED: inc
+// CHECK_NOT_CALLED: run
+
+class Countable {
+    var count = 0
+}
+
+inline fun inc(countable: Countable) = countable.count++
+
+inline fun run(func: () -> Unit) = func()
+
+fun incNoInline(countable: Countable) = run { inc(countable) }
+
+fun box(): String {
+    val c = Countable()
+
+    incNoInline(c)
+    assertEquals(1, c.count)
+
+    return "OK"
+}