Update cl_ext_float_atomics patch

[wenju-he]

Guard atomic_double with cl_khr_int64_base_atomics and
cl_khr_int64_extended_atomics.

[haonanya]

Thanks for your fix. This is discussed previously on https://reviews.llvm.org/D106343.
It may need some update on specification level so I submit the patch without cl_khr_int64_base_atomics guard at that time.

[wenju-he]

Thanks for your fix. This is discussed previously on https://reviews.llvm.org/D106343. It may need some update on specification level so I submit the patch without cl_khr_int64_base_atomics guard at that time.

I see, please follow up, thanks. I think the guard is needed.