[Truffle] Remove prettyprint shims and import real code.

Author: chrisseaton

core/src/main/java/org/jruby/truffle/nodes/core/KernelNodes.java

@@ -1379,33 +1379,6 @@ public ObjectIDNode(ObjectIDNode prev) {
 
     }
 
-    /*
-     * Kernel#pretty_inspect is normally part of stdlib, in pp.rb, but we aren't able to execute
-     * that file yet. Instead we implement a very simple version here, which is the solution
-     * suggested by RubySpec.
-     */
-
-    @CoreMethod(names = "pretty_inspect")
-    public abstract static class PrettyInspectNode extends CoreMethodNode {
-
-        @Child protected DispatchHeadNode inspectNode;
-
-        public PrettyInspectNode(RubyContext context, SourceSection sourceSection) {
-            super(context, sourceSection);
-            inspectNode = DispatchHeadNode.onSelf(context);
-        }
-
-        public PrettyInspectNode(PrettyInspectNode prev) {
-            super(prev);
-            inspectNode = prev.inspectNode;
-        }
-
-        @Specialization
-        public Object prettyInspect(VirtualFrame frame, Object self) {
-            return inspectNode.call(frame, self, "inspect", null);
-        }
-    }
-
     @CoreMethod(names = "print", isModuleFunction = true, argumentsAsArray = true)
     public abstract static class PrintNode extends CoreMethodNode {
 

core/src/main/java/org/jruby/truffle/runtime/subsystems/FeatureManager.java

@@ -62,11 +62,6 @@ public boolean require(String path, String feature, RubyNode currentNode) throws
                     return true;
                 }
 
-                if (feature.equals("pp")) {
-                    // Kernel#pretty_inspect is always there
-                    return true;
-                }
-
                 if (feature.equals("thread")) {
                     return true;
                 }

lib/ruby/truffle/mri/pp.rb

@@ -0,0 +1 @@
+require_relative '../../stdlib/pp'

lib/ruby/truffle/mri/prettyprint.rb

@@ -0,0 +1 @@
+require_relative '../../stdlib/prettyprint'