[JS IR] De-optimize equality operator as workaround for KT-57509

(cherry picked from commit 32d1fba)

Author: anton-bannykh

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/calls/EqualityAndComparisonCallsTransformer.kt

@@ -99,8 +99,9 @@ class EqualityAndComparisonCallsTransformer(context: JsIrBackendContext) : Calls
         val equalsMethod = lhs.type.findEqualsMethod()
 
         return when {
-            lhs.type is IrDynamicType ->
-                irCall(call, intrinsics.jsEqeq)
+// Temporarily de-optimize dynamic equality due to KT-57509
+//            lhs.type is IrDynamicType ->
+//                irCall(call, intrinsics.jsEqeq)
 
             // Special optimization for "<expression> == null"
             lhs.isNullConst() || rhs.isNullConst() ->

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/BoxJsTestGenerated.java

@@ -0,0 +1,17 @@
+// WITH_STDLIB
+
+fun demo(x: dynamic, a: Array<out dynamic>): Boolean? {
+    return a.any { y: Any ->
+        val newX: Any = x.unsafeCast<Any>()
+        y == newX
+    }
+}
+
+data class X(val x: Int)
+
+fun box(): String {
+
+    if (demo(X(1), arrayOf(X(1))) != true) return "fail"
+
+    return "OK"
+}