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After #145996 CLANG_RESOURCE_DIR can be an absolute path so we need to handle it correctly in the driver. llvm::sys::path::append does not append absolute paths in the way that I expected (or consistent with other similar APIs such as C++17 std::filesystem::path::append or Python os.path.join); instead, it effectively discards the leading / and appends the resulting relative path (e.g. append(P, "/bar") with P = "/foo" sets P to "/foo/bar"). Many tests start failing if I try to align llvm::sys::path::append with the other APIs because of callers that expect the existing behavior, so for now let's add a special case here for absolute resource paths, and document the behavior in Path.h. Reviewers: MaskRay Reviewed By: MaskRay Pull Request: https://github.com/llvm/llvm-project/pull/146449
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