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c844d483ff
This adds a check in lit.local.cfg for whether the current C++ stdlib contains the 'span' header. If so, the llvm-lit feature 'std_span' is set. Also adds 'REQUIRES: std_span' to interop tests that include 'span'. This means we no longer have to choose between blanket disabling `std::span` tests on all Linux distributions, or listing every Linux distro with a libstdc++ version without `std::span` support as unsupported. I couldn't find any existing path to the MSVC stdlib in lit, and we don't test versions of MSVC old enought to not support std::span anyways, so 'std_span' is unconditionally enabled when targeting windows-msvc. rdar://161999160 rdar://161999174 rdar://162106580 rdar://162106619 rdar://162106643 rdar://162106653 rdar://162106722 rdar://162106747