JVM_IR: add test for calling monitorEnter/Exit from serialized code.

compiler/testData/codegen/boxInline/special/monitorEnterExit.kt

@@ -0,0 +1,20 @@
+// TARGET_BACKEND: JVM_IR
+// WITH_RUNTIME
+// FILE: mySynchronized.kt
+
+import kotlin.jvm.internal.unsafe.*
+
+public inline fun <R> mySynchronized(lock: Any, block: () -> R): R {
+    @Suppress("NON_PUBLIC_CALL_FROM_PUBLIC_INLINE", "INVISIBLE_MEMBER")
+    monitorEnter(lock)
+    try {
+        return block()
+    }
+    finally {
+        @Suppress("NON_PUBLIC_CALL_FROM_PUBLIC_INLINE", "INVISIBLE_MEMBER")
+        monitorExit(lock)
+    }
+}
+
+// FILE: box.kt
+fun box() = mySynchronized(Any()) { "OK" }