Add contract for 'synchronized'

^KT-25962 Fixed

compiler/testData/diagnostics/testsWithStdLib/contracts/fromStdlib/synchronize.kt

@@ -0,0 +1,11 @@
+// !LANGUAGE: +ReadDeserializedContracts +UseCallsInPlaceEffect
+
+fun test(lock: Any) {
+    val x: Int
+
+    synchronized(lock) {
+        x = 42
+    }
+
+    x.inc()
+}

compiler/testData/diagnostics/testsWithStdLib/contracts/fromStdlib/synchronize.txt

@@ -0,0 +1,3 @@
+package
+
+public fun test(/*0*/ lock: kotlin.Any): kotlin.Unit