Removed buffer-like messages from String

Author: otethal

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/object/DefaultPythonStringExports.java

@@ -84,22 +84,6 @@ static Object getLazyPythonClass(@SuppressWarnings("unused") String value) {
         return PythonBuiltinClassType.PString;
     }
 
-    @ExportMessage
-    static boolean isBuffer(@SuppressWarnings("unused") String str) {
-        return false;
-    }
-
-    @ExportMessage
-    static int getBufferLength(@SuppressWarnings("unused") String str) {
-        return getBufferBytes(str).length;
-    }
-
-    @ExportMessage
-    @TruffleBoundary
-    static byte[] getBufferBytes(String str) {
-        return str.getBytes();
-    }
-
     @ExportMessage
     @TruffleBoundary
     static long hashWithState(String self, @SuppressWarnings("unused") ThreadState state) {