improve dispatch on PFunction, PBuiltinFunction, and PythonBuiltinClass by exporting getLazyPythonClass and thus unifying the type check with the PythonBuiltinClassType

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/function/PBuiltinFunction.java

@@ -158,4 +158,11 @@ public PKeyword[] getKwDefaults() {
     public boolean isCallable() {
         return true;
     }
+
+    @Override
+    @ExportMessage
+    @SuppressWarnings("static-method")
+    public Object getLazyPythonClass() {
+        return PythonBuiltinClassType.PBuiltinFunction;
+    }
 }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/function/PFunction.java

@@ -220,4 +220,11 @@ private static SourceSection getForeignSourceSection(RootNode rootNode) {
     public boolean hasSourceLocation() {
         return getSourceLocationDirect() != null;
     }
+
+    @Override
+    @ExportMessage
+    @SuppressWarnings("static-method")
+    public Object getLazyPythonClass() {
+        return PythonBuiltinClassType.PFunction;
+    }
 }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/type/PythonBuiltinClass.java

@@ -97,4 +97,12 @@ String getMetaSimpleName() {
     String getMetaQualifiedName() {
         return type.getQualifiedName();
     }
+
+    @Override
+    @ExportMessage
+    @SuppressWarnings("static-method")
+    public Object getLazyPythonClass() {
+        // all built-in types have "type" as metaclass
+        return PythonBuiltinClassType.PythonClass;
+    }
 }