Forbid @Synchronized annotation on suspend functions

and lambdas. With warning for now.
 #KT-27333

compiler/testData/diagnostics/testsWithStdLib/inline/synchronizedOnSuspend.fir.kt

@@ -0,0 +1,24 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// SKIP_TXT
+
+@Synchronized
+suspend fun foo(f: () -> Unit): Unit = f()
+
+fun builder(c: suspend () -> Unit) {}
+
+val a: suspend () -> Unit
+    get() = @Synchronized {}
+val b: suspend () -> Unit = @Synchronized {}
+val c = builder (@Synchronized {})
+val d = suspend @Synchronized {}
+val e = <!WRONG_ANNOTATION_TARGET!>@Synchronized<!> suspend {}
+
+fun test() {
+    @Synchronized
+    suspend fun foo(f: () -> Unit): Unit = f()
+
+    val b: suspend () -> Unit = @Synchronized {}
+    val c = builder (@Synchronized {})
+    val d = suspend @Synchronized {}
+    val e = <!WRONG_ANNOTATION_TARGET!>@Synchronized<!> suspend {}
+}

compiler/testData/diagnostics/testsWithStdLib/inline/synchronizedOnSuspend.kt

@@ -0,0 +1,24 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// SKIP_TXT
+
+<!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!>
+suspend fun foo(f: () -> Unit): Unit = f()
+
+fun builder(c: suspend () -> Unit) {}
+
+val a: suspend () -> Unit
+    get() = <!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {}
+val b: suspend () -> Unit = <!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {}
+val c = builder (<!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {})
+val d = suspend <!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {}
+val e = <!WRONG_ANNOTATION_TARGET!>@Synchronized<!> suspend {}
+
+fun test() {
+    <!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!>
+    suspend fun foo(f: () -> Unit): Unit = f()
+
+    val b: suspend () -> Unit = <!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {}
+    val c = builder (<!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {})
+    val d = suspend <!SYNCHRONIZED_ON_SUSPEND!>@Synchronized<!> {}
+    val e = <!WRONG_ANNOTATION_TARGET!>@Synchronized<!> suspend {}
+}