[K/N] Implement isExperimentalMM intrinsic

kotlin-native/backend.native/tests/build.gradle

@@ -4296,6 +4296,11 @@ task interop_sourceCodeStruct(type: KonanLocalTest) {
     source = "codegen/intrinsics/interop_sourceCodeStruct.kt"
 }
 
+standaloneTest("isExperimentalMM") {
+    source = "codegen/intrinsics/isExperimentalMM.kt"
+    flags = [ "-tr" ]
+}
+
 interopTest("interop_cppClass") {
     disabled = (project.testTarget == 'wasm32') // No interop for wasm yet.
     source = "interop/cpp/cppClass.kt"

kotlin-native/backend.native/tests/codegen/intrinsics/isExperimentalMM.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+import kotlin.test.*
+import kotlin.native.Platform
+
+@Test
+@OptIn(kotlin.ExperimentalStdlibApi::class)
+fun testIsExperimentalMM() {
+    if (isExperimentalMM()) {
+        assertEquals(Platform.memoryModel, MemoryModel.EXPERIMENTAL)
+    } else {
+        assertNotEquals(Platform.memoryModel, MemoryModel.EXPERIMENTAL)
+    }
+}