[test] Use a per-test module cache for %target-swift-frontend on Linux. #5824
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This was always the intent, but whoever updated it for Apple platforms must have missed Linux. This *shouldn't* make a difference---because we should already be rebuilding the module cache whenever there's a Clang change---but it seems to be affecting things nonetheless.
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See https://ci.swift.org/job/oss-swift-incremental-RA-linux-ubuntu-16_04/664/ for a sample issue. @swift-ci Please smoke test and merge |
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This was always the intent, but whoever updated it for Apple platforms must have missed Linux. This shouldn't make a difference—because we should already be rebuilding the module cache whenever there's a Clang change—but it seems to be affecting things nonetheless.