Fix warning about useless @ReportPolymorphism annotation

Author: andrykonchin

src/main/java/org/truffleruby/cext/CExtNodes.java

@@ -1050,7 +1050,6 @@ Object rbConstSet(RubyModule module, Object name, Object value,
     }
 
     @Primitive(name = "rb_gv_get")
-    @ReportPolymorphism
     public abstract static class RbGvGetNode extends PrimitiveArrayArgumentsNode {
         @Specialization
         Object rbGvGet(VirtualFrame frame, String name,
@@ -1075,6 +1074,7 @@ Object rbGvGet(VirtualFrame frame, String name,
     }
 
 
+    @ReportPolymorphism
     @GenerateInline
     @GenerateCached(false)
     public abstract static class RbGvGetInnerNode extends RubyBaseNode {

src/main/java/org/truffleruby/core/array/ArrayNodes.java

@@ -1806,7 +1806,6 @@ public void accept(Node node, CallBlockNode yieldNode, RubyArray array, Object s
     @NodeChild(value = "array", type = RubyNode.class)
     @NodeChild(value = "other", type = RubyBaseNodeWithExecute.class)
     @ImportStatic(ArrayGuards.class)
-    @ReportPolymorphism
     public abstract static class ReplaceNode extends CoreMethodNode {
 
         @NeverDefault

src/main/java/org/truffleruby/core/binding/BindingNodes.java

@@ -299,7 +299,6 @@ static Object localVariableGetLastLine(Node node, RubyBinding binding, String na
         }
     }
 
-    @ReportPolymorphism
     @CoreMethod(names = "local_variable_set", required = 2)
     public abstract static class BindingLocalVariableSetNode extends CoreMethodArrayArgumentsNode {
 
@@ -313,6 +312,7 @@ Object localVariableSet(RubyBinding binding, Object nameObject, Object value,
     }
 
 
+    @ReportPolymorphism
     @GenerateUncached
     @ImportStatic({ BindingNodes.class, FindDeclarationVariableNodes.class })
     @GenerateCached(false)