[CAS] Improve error message when module cache key is missing #10517
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When a module cache key is missing, emit better diagnostics that * It is clear it is a cache key missing, so a potential dependency missing, not a CAS error * For other compiler consumers, like a swift compiler that uses a different cache key schema than the clang include tree, it is possible that a detailed cache key cannot be printed. Don't emit extra schema mismatch message that can confuse the users rdar://149707188
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@swift-ci please test llvm |
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When a module cache key is missing, emit better diagnostics that
rdar://149707188