[K/N][IR][codegen] Implemented eager initialization

Properties marked with @EagerInitialization will be initialized at program/worker start
even in lazy initialization mode

kotlin-native/backend.native/tests/codegen/initializers/eagerInitializationThreadLocal2.kt

@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+
+// FILE: lib.kt
+@ThreadLocal
+var z1 = false
+var z2 = false
+@ThreadLocal
+var z3 = false
+
+// FILE: lib2.kt
+import kotlin.test.*
+
+@OptIn(kotlin.ExperimentalStdlibApi::class)
+@EagerInitialization
+@ThreadLocal
+val x = run { z1 = true; 42 }
+
+// Won't be initialized (cause no function from the file will be called during [x] initialization).
+val y1 = run { z2 = true; 117 }
+
+@ThreadLocal
+val y2 = run { z3 = true; 117 }
+
+// FILE: main.kt
+import kotlin.test.*
+
+fun main() {
+    assertTrue(z1)
+    assertFalse(z2)
+    assertFalse(z3)
+}