[llvm-dev] XFAILing tests on host features

[Hubert Tong via llvm-dev]

Some tests, such as llvm/test/tools/llvm-cov/range_based_for.cpp are
expected to fail on big-endian systems. This is a property of the host, but
the tests use XFAIL with a list of triple substrings. The documentation
indicates that triple substrings are evaluated with respect to the target
triple (and not the host triple).

It seems these tests should instead use REQUIRES on a (new) host feature
for "host-little-endian".

-- HT
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