Remove dead ducc_fft code.

I guess this was omitted when we switched over to using stablehlo.fft since XLA now calls DUCC itself. PiperOrigin-RevId: 684424416
jax-ml · Oct 10, 2024 · b51223c · b51223c
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diff --git a/jax/_src/internal_test_util/export_back_compat_test_util.py b/jax/_src/internal_test_util/export_back_compat_test_util.py
@@ -20,8 +20,7 @@
 The tests in this file refer to the test data in
 jax/_src/internal_test_util/export_back_compat_test_data.
 
-There is one test for each version of a custom call target, e.g.,
-`test_ducc_fft` tests the FFT custom calls on CPU.
+There is one test for each version of a custom call target.
 Only custom call targets tested here should be listed in
 export._CUSTOM_CALL_TARGETS_GUARANTEED_STABLE. All other custom
 call targets will result in an error when encountered during serialization.

diff --git a/jaxlib/ducc_fft.py b/jaxlib/ducc_fft.py