Minor refractor

Author: Adam Hrbac

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/bytecode/PBytecodeRootNode.java

@@ -1078,8 +1078,7 @@ private Object bytecodeLoop(VirtualFrame virtualFrame, Frame localFrame, Bytecod
 
         final PythonLanguage language = PythonLanguage.get(this);
         final Assumption noTrace = language.noTracingAssumption;
-        final PythonContext pythonContext = PythonContext.get(this);
-        final PythonContext.PythonThreadState threadState = pythonContext.getThreadState(language);
+        final PythonContext.PythonThreadState threadState = PythonContext.get(this).getThreadState(language);
 
         /*
          * We use an object as a workaround for not being able to specify which local variables are