cuda::is_bitwise_comparable

[fbusato]

Description

Followup of the discussion in

• Recover warp_shuffle original behavior (revert #8210) #8254

The PR introduces cuda::is_bitwise_comparable to:

1. Allow user specification.
2. Disable comparison of types that are actually not bit bitwise comparable, namely extended floating-point types.

The new trait relies on has_unique_object_representations_v but is disabled the following cases:

• extended floating-point types.
• extended floating-point vector types.
• Raw arrays, cuda::std::array of extended floating-point.
• cuda::std::pair of extended floating-point.
• cuda::std::tuple of extended floating-point.
• Nested compositions of the above cases.

Potentially affected paths by cuda::std::is_bitwise_comparable:

• cuda::device::warp_match_all

[github-actions]

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