fix style

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/PNodeWithContext.java

@@ -41,10 +41,7 @@
 package com.oracle.graal.python.nodes;
 
 import com.oracle.graal.python.PythonLanguage;
-import com.oracle.graal.python.builtins.PythonBuiltinClassType;
 import com.oracle.graal.python.runtime.exception.ExceptionUtils;
-import com.oracle.graal.python.runtime.exception.PException;
-import com.oracle.graal.python.runtime.object.PythonObjectFactory;
 import com.oracle.truffle.api.Assumption;
 import com.oracle.truffle.api.CompilerAsserts;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;