[test] Move irJsText tests to irText directory

So that all irText tests could be found in one place

compiler/testData/ir/irText/js/dynamic/implicitCastToDynamic.kt

@@ -0,0 +1,32 @@
+val d1: dynamic = 1
+
+val p: Int = 1
+
+var d2: dynamic = p
+
+fun withDynamic(d: dynamic) = d
+
+fun test1(s: String) {
+    withDynamic(s)
+}
+
+fun test2(a: Any) {
+    val d: dynamic = a
+}
+
+fun test3(a: Any?) {
+    val d: dynamic = a
+}
+
+fun test4(a: Any, s: String, na: Any?) {
+    var d: dynamic = p
+    d = a
+    d = na
+    d = s
+}
+
+fun test5(a: Any, s: String, na: Any?) {
+    d2 = a
+    d2 = na
+    d2 = s
+}