Fix build on aarch64 by avoiding an ICE

https://github.com/numpy/numpy/issues/27699#issuecomment-2692261936

Index: numpy/_core/src/umath/loops_autovec.dispatch.c.src
--- numpy/_core/src/umath/loops_autovec.dispatch.c.src.orig
+++ numpy/_core/src/umath/loops_autovec.dispatch.c.src
@@ -104,11 +104,13 @@ NPY_NO_EXPORT void NPY_CPU_DISPATCH_CURFX(@TYPE@_right
 #endif
 }
 
+#pragma GCC optimize ("0")  // Deactivate optimisations
 NPY_NO_EXPORT void NPY_CPU_DISPATCH_CURFX(@TYPE@_bitwise_count)
 (char **args, npy_intp const *dimensions, npy_intp const *steps, void *NPY_UNUSED(func))
 {
     UNARY_LOOP_FAST(@type@, npy_ubyte, *out = npy_popcount@c@(in));
 }
+#pragma GCC reset_options  // Re-activate optimisations
 
 /**end repeat**/
 
