[build.ps1] Support llvm-lit tests with REQUIRES: native
condition on Windows
#77005
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lit adds the
native
item in available_features, if the target-triple and host-triple strings are equivalent. While we hardcode LLVM_DEFAULT_TARGET_TRIPLE tox86_64-unknown-windows-msvc
in the CMake cache file, LLVM_HOST_TRIPLE is inferred automatically, which results inx86_64-pc-windows-msvc
.These triples are compatible, but not string-equivalent and so lit skips all related tests. Let's fix by setting LLVM_HOST_TRIPLE explicitly. We cannot do it in the cache file, because we have to consider cross-compilation.