[K/JS] Add support of compilation with ES-classes

compiler/testData/codegen/box/multiplatform/defaultArguments/dispatchReceiverValue.kt

@@ -1,5 +1,5 @@
 // IGNORE_BACKEND: WASM
-// IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND: JS_IR, JS_IR_ES6
 // WASM_MUTE_REASON: EXPECT_DEFAULT_PARAMETERS
 // IGNORE_BACKEND_K2: JVM_IR, NATIVE
 // FIR status: default argument mapping in MPP isn't designed yet

compiler/testData/codegen/box/multiplatform/defaultArguments/nestedEnumEntryValue.kt

@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: JS_IR, WASM
+// IGNORE_BACKEND: JS_IR, JS_IR_ES6, WASM
 //  JS IR & Wasm: https://youtrack.jetbrains.com/issue/KT-51225
 // IGNORE_BACKEND_K2: JVM_IR, NATIVE
 // FIR status: default argument mapping in MPP isn't designed yet

compiler/testData/codegen/box/multiplatform/multiModule/defaultArgument.kt

@@ -4,6 +4,7 @@
 // IGNORE_BACKEND: WASM
 // IGNORE_BACKEND: JS
 // IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND: JS_IR_ES6
 // IGNORE_BACKEND: NATIVE
 // DONT_TARGET_EXACT_BACKEND: JVM
 // DONT_TARGET_EXACT_BACKEND: JVM_IR

compiler/testData/codegen/box/multiplatform/multiModule/expectActualLink.kt

@@ -3,6 +3,7 @@
 // EXPECT_ACTUAL_LINKER
 // IGNORE_BACKEND: JS
 // IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND: JS_IR_ES6
 // IGNORE_BACKEND: NATIVE
 // DONT_TARGET_EXACT_BACKEND: JVM
 // DONT_TARGET_EXACT_BACKEND: JVM_IR

compiler/testData/codegen/box/multiplatform/multiModule/expectActualMemberLink.kt

@@ -3,6 +3,7 @@
 // EXPECT_ACTUAL_LINKER
 // IGNORE_BACKEND: JS
 // IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND: JS_IR_ES6
 // IGNORE_BACKEND: NATIVE
 // DONT_TARGET_EXACT_BACKEND: JVM
 // DONT_TARGET_EXACT_BACKEND: JVM_IR