JS: prevent optimizer from removing access to dynamic property access. See KT-15278

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -1400,6 +1400,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("propertySideEffect.kt")
+        public void testPropertySideEffect() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/dynamic/propertySideEffect.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("setByBrackets.kt")
         public void testSetByBrackets() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/dynamic/setByBrackets.kt");

js/js.translator/src/org/jetbrains/kotlin/js/translate/utils/JsDescriptorUtils.java

@@ -30,6 +30,7 @@ import org.jetbrains.kotlin.js.translate.context.TranslationContext;
 import org.jetbrains.kotlin.name.Name;
 import org.jetbrains.kotlin.psi.KtExpression;
 import org.jetbrains.kotlin.resolve.DescriptorUtils;
+import org.jetbrains.kotlin.resolve.calls.tasks.DynamicCallsKt;
 import org.jetbrains.kotlin.resolve.scopes.receivers.ImplicitReceiver;
 import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue;
 import org.jetbrains.kotlin.types.KotlinType;
@@ -137,8 +138,8 @@ public final class JsDescriptorUtils {
     }
 
     public static boolean sideEffectsPossibleOnRead(@NotNull PropertyDescriptor property) {
-        return !isDefaultAccessor(property.getGetter()) || ModalityKt.isOverridableOrOverrides(property) ||
+        return DynamicCallsKt.isDynamic(property) || !isDefaultAccessor(property.getGetter()) ||
-                isStaticInitializationPossible(property);
+               ModalityKt.isOverridableOrOverrides(property) || isStaticInitializationPossible(property);
     }
 
     private static boolean isStaticInitializationPossible(PropertyDescriptor property) {

js/js.translator/testData/box/dynamic/propertySideEffect.js

@@ -0,0 +1,10 @@
+var log = "";
+
+function C() {
+}
+Object.defineProperty(C.prototype, "foo", {
+    "get" : function () {
+        log += "foo called";
+        return "OK"
+    }
+});

js/js.translator/testData/box/dynamic/propertySideEffect.kt

@@ -0,0 +1,13 @@
+external class C
+
+inline val C.foo: String
+    get() = asDynamic().foo
+
+external val log: String
+
+fun box(): String {
+    val c = C()
+    c.foo
+    if (log != "foo called") return "fail: $log"
+    return "OK"
+}