Implement lateinit in backend

compiler/testData/codegen/box/properties/lateinit/accessorException.kt

@@ -0,0 +1,21 @@
+public class A {
+
+    fun getMyStr(): String {
+        try {
+            val a = str
+        } catch (e: NullPointerException) {
+            return "OK"
+        }
+
+        return "FAIL"
+    }
+
+    private companion object {
+        private lateinit var str: String
+    }
+}
+
+fun box(): String {
+    val a = A()
+    return a.getMyStr()
+}