Add support for [[lifetimebound]]
#7155
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Description
The PR introduces the
_CCCL_LIFETIMEBOUNDmacro to handle thelifetimeboundattribute across different compilers, including Clang and MSVC.The macro will be useful to trigger compile-time warning for potentially dangling references.
One example is
mdspan to DLPack#7027Thanks @gevtushenko for the idea