KT-36992 Do not generate annotations on synthetic accessors

Also, do not generate nullability annotations on synthetic methods.

compiler/testData/codegen/box/coroutines/tailCallOptimizations/unit/override5_ir.txt

@@ -42,7 +42,7 @@ public final class Override5Kt$inlineMe$1$generic$2 {
     inner class Override5Kt$inlineMe$1$generic$2
     static method <clinit>(): void
     public method <init>(): void
-    public synthetic bridge @org.jetbrains.annotations.Nullable method invoke(): java.lang.Object
+    public synthetic bridge method invoke(): java.lang.Object
     public final method invoke(): void
 }