[BUG] Broken copy.hpp

[kroburg]

Describe the bug
I can't compile cute/copy.hpp. Get error:
cutlass/include/cute/atom/copy_traits_sm90_tma.hpp(73): error: namespace "cute::detail" has no member "is_prefetch"

Steps/Code to reproduce bug
test.cu
#include <cute/algorithm/copy.hpp>

/usr/local/cuda/bin/nvcc -forward-unknown-to-host-compiler -I/usr/local/cuda/include -Icontrib/cutlass/include -Icontrib/cutlass/tools/util/include -g --generate-code=arch=compute_89,code=[compute_89,sm_89] -x cu -c test.cu -o test.cu.o

contrib/cutlass/include/cute/atom/copy_traits_sm90_tma.hpp(71): error: namespace "cute::detail" has no member "is_prefetch"
      if constexpr (detail::is_prefetch<CopyOp>) {
                            ^

contrib/cutlass/include/cute/atom/copy_traits_sm90_tma.hpp(71): error: type name is not allowed
      if constexpr (detail::is_prefetch<CopyOp>) {
                                        ^

contrib/cutlass/include/cute/atom/copy_traits_sm90_tma.hpp(71): error: expected an expression
      if constexpr (detail::is_prefetch<CopyOp>) {
                                               ^

3 errors detected in the compilation of "test.cu".

[thakkarV]

Please see #1484

[kroburg]

Please see #1484

Thank you!

Please notice that actual broken code is Flash Attention.

[thakkarV]

Yes there's a fix coming for that specific issue imminently.

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