minor cleanup - extract err msg to ErrorMessages

Author: tomasstupka

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

@@ -132,6 +132,7 @@ public abstract class ErrorMessages {
     public static final String CANNOT_DELETE_MEMORY = "cannot delete memory";
     public static final String CANNOT_MODIFY_READONLY_MEMORY = "cannot modify read-only memory";
     public static final String CANNOT_EXTEND_INCOMPLETE_P = "Cannot extend an incomplete type '%p'";
+    public static final String CANNOT_FIT_P_INTO_INDEXSIZED_INT = "cannot fit '%p' into an index-sized integer";
     public static final String CANNOT_GET_SHAPE_OF_NATIVE_CLS = "cannot get shape of native class";
     public static final String CANNOT_GET_CONSISTEMT_METHOD_RESOLUTION = "Cannot create a consistent method resolution\norder (MRO) for bases %s";
     public static final String CANNOT_HANDLE_ZIP_FILE = "cannot handle Zip file: '%s'";

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

@@ -86,7 +86,7 @@ public final PException raise(PythonBuiltinClassType type, Exception e) {
      * specified {@code type} as exception class.
      */
     public final PException raiseNumberTooLarge(Object type, Object result) {
-        return execute(type, PNone.NO_VALUE, "cannot fit '%p' into an index-sized integer", new Object[]{result});
+        return execute(type, PNone.NO_VALUE, ErrorMessages.CANNOT_FIT_P_INTO_INDEXSIZED_INT, new Object[]{result});
     }
 
     public final PException raiseHasNoLength(Object result) {