Remove a couple ReportPolymorphism annotations which have no effect

* Those nodes have only a single specialization with a single instance.

Author: eregon

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

@@ -823,7 +823,6 @@ protected Object deleteAtCopying(RubyArray array, int index,
 
     @CoreMethod(names = "each", needsBlock = true, enumeratorSize = "size")
     @ImportStatic(ArrayGuards.class)
-    @ReportPolymorphism
     public abstract static class EachNode extends YieldingCoreMethodNode implements ArrayElementConsumerNode {
 
         @Specialization
@@ -841,7 +840,6 @@ public void accept(RubyArray array, RubyProc block, Object element, int index) {
 
     @Primitive(name = "array_each_with_index")
     @ImportStatic(ArrayGuards.class)
-    @ReportPolymorphism
     public abstract static class EachWithIndexNode extends PrimitiveArrayArgumentsNode
             implements ArrayElementConsumerNode {