[K/N][Tests] Support test directive ASSERTIONS_MODE

^KT-64844 Fixed

compiler/testData/codegen/box/assert/alwaysDisable.kt

@@ -1,13 +1,14 @@
 // IGNORE_BACKEND: WASM
 // WASM_MUTE_REASON: STDLIB_ASSERT
 // KT-59059
-// IGNORE_BACKEND: NATIVE
 // IGNORE_BACKEND: JS_IR
 // IGNORE_BACKEND: JS_IR_ES6
 // IGNORE_BACKEND: JS
 // ASSERTIONS_MODE: always-disable
 // WITH_STDLIB
 
+@file:Suppress("OPT_IN_USAGE_ERROR") // ExperimentalNativeApi is defined only in Native
+
 fun checkTrue(): Boolean {
     var hit = false
     val l = { hit = true; true }

compiler/testData/codegen/box/assert/alwaysEnable.kt

@@ -2,7 +2,6 @@
 // IGNORE_BACKEND: JS_IR
 // IGNORE_BACKEND: JS_IR_ES6
 // IGNORE_BACKEND: JS
-// IGNORE_NATIVE: optimizationMode=OPT
 // ASSERTIONS_MODE: always-enable
 // WITH_STDLIB