Add missing NumPy 1.21 xfails

Author: asmeurer

numpy-1-21-xfails.txt

@@ -160,6 +160,7 @@ array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is -0 and x2_i >
 array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is -infinity and x2_i < 0 and not (x2_i.is_integer() and x2_i % 2 == 1)) -> +0]
 array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is -infinity and x2_i < 0 and x2_i.is_integer() and x2_i % 2 == 1) -> -0]
 array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is -infinity and x2_i > 0 and x2_i.is_integer() and x2_i % 2 == 1) -> -infinity]
+array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is NaN and not x2_i == 0) -> NaN]
 array_api_tests/test_special_cases.py::test_binary[__truediv__(x1_i < 0 and x2_i is +0) -> -infinity]
 array_api_tests/test_special_cases.py::test_binary[__truediv__(x1_i < 0 and x2_i is -0) -> +infinity]
 array_api_tests/test_special_cases.py::test_binary[__truediv__(x1_i > 0 and x2_i is +0) -> +infinity]
@@ -191,6 +192,7 @@ array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is +0 and x
 array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is -0 and x2_i < 0) -> +0]
 array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is -0 and x2_i > 0) -> -0]
 array_api_tests/test_special_cases.py::test_binary[pow(abs(x1_i) < 1 and x2_i is +infinity) -> +0]
+array_api_tests/test_special_cases.py::test_binary[pow(abs(x1_i) < 1 and x2_i is -infinity) -> +infinity]
 array_api_tests/test_special_cases.py::test_binary[pow(abs(x1_i) > 1 and x2_i is +infinity) -> +infinity]
 array_api_tests/test_special_cases.py::test_binary[pow(abs(x1_i) > 1 and x2_i is -infinity) -> +0]
 array_api_tests/test_special_cases.py::test_binary[pow(x1_i < 0 and isfinite(x1_i) and isfinite(x2_i) and not x2_i.is_integer()) -> NaN]