[PATCH] Implement C++20 P1023 for __debug::array

[François Dumont]

This is a missing part of C++20 P1023 for __debug::array.

 Â Â Â  Implement C++20 p1023 - constexpr comparison operators for 
__debug::array.
 Â Â Â  * include/debug/array: Add C++20 constexpr to comparison operators.
 Â Â Â  * testsuite/23_containers/array/tuple_interface/get_debug_neg.cc: Adapt
 Â Â Â  dg-error line numbers.
 Â Â Â  * testsuite/23_containers/array/tuple_interface/
 Â Â Â  tuple_element_debug_neg.cc: Likewise.


Tested under Linux x86_64 normal and debug modes.

François

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