KT-4825 Implement "synchronized" properly via monitorenter/monitorexit

#KT-4825 Fixed

compiler/testData/codegen/boxWithStdlib/fullJdk/synchronized/finally.kt

@@ -0,0 +1,25 @@
+fun box(): String {
+    val obj = "" as java.lang.Object
+
+    try {
+        synchronized (obj) {
+            throw Throwable()
+        }
+    }
+    catch (e: Throwable) {
+        // If monitorexit didn't happen (a finally block failed), this assertion would fail
+        assertThatThreadDoesNotOwnMonitor(obj)
+    }
+
+    return "OK"
+}
+
+fun assertThatThreadDoesNotOwnMonitor(obj: java.lang.Object) {
+    try {
+        obj.wait(1)
+        throw IllegalStateException("Not owning a monitor!")
+    }
+    catch (e: IllegalMonitorStateException) {
+        // OK
+    }
+}

compiler/testData/codegen/boxWithStdlib/fullJdk/synchronized/nestedDifferentObjects.kt

@@ -0,0 +1,13 @@
+fun box(): String {
+    val obj = "" as java.lang.Object
+    val obj2 = "1" as java.lang.Object
+
+    synchronized (obj) {
+        synchronized (obj2) {
+            obj.wait(1)
+            obj2.wait(1)
+        }
+    }
+
+    return "OK"
+}

compiler/testData/codegen/boxWithStdlib/fullJdk/synchronized/nestedSameObject.kt

@@ -0,0 +1,11 @@
+fun box(): String {
+    val obj = "" as java.lang.Object
+
+    synchronized (obj) {
+        synchronized (obj) {
+            obj.wait(1)
+        }
+    }
+
+    return "OK"
+}

compiler/testData/codegen/boxWithStdlib/fullJdk/synchronized/wait.kt

@@ -0,0 +1,16 @@
+fun box(): String {
+    val obj = "" as java.lang.Object
+    try {
+        obj.wait(1)
+        return "Fail: exception should have been thrown"
+    }
+    catch (e: IllegalMonitorStateException) {
+        // OK
+    }
+
+    synchronized (obj) {
+        obj.wait(1)
+    }
+
+    return "OK"
+}