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

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

@@ -0,0 +1,27 @@
+package foo
+
+// CHECK_CONTAINS_NO_CALLS: add
+
+internal data class IntPair(public var fst: Int, public var snd: Int) {
+    inline public fun getFst(): Int { return fst }
+    inline public fun setFst(v: Int) { fst = v }
+
+    inline public fun getSnd(): Int { return this.snd }
+    inline public fun setSnd(v: Int) { this.snd = v }
+}
+
+internal fun add(p: IntPair, toFst: Int, toSnd: Int) {
+    val fst = p.getFst()
+    p.setFst(fst + toFst)
+
+    val snd = p.getSnd()
+    p.setSnd(snd + toSnd)
+}
+
+fun box(): String {
+    val p = IntPair(0, 0)
+    add(p, 1, 2)
+    assertEquals(IntPair(1, 2), p)
+
+    return "OK"
+}