XML regression test failure

$ make -C src/test/regress runtest
[ ... ]
test xml                  ... FAILED
test stats                ... ok
test tablespace           ... ok

========================
 1 of 105 tests failed.
========================

The regression.diffs are attached. Note that this reproduces
consistently, but only occurs if I use the "runtest" Makefile target
(i.e. run the regression tests in serial mode); "make check" works fine,
for example.

-Neil