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Summary: This change is necessary for D46464, which will pass -1 as the Task ID for distributed backends, so that the save temps files don't end up with "4294967295" in their path. For distributed back ends, when -1 is passed, don't append any Task ID. An existing test (tools/clang/test/CodeGen/thinlto_backend.ll) will fail without this change after D46464. Reviewers: pcc Subscribers: mehdi_amini, inglorion, llvm-commits Differential Revision: https://reviews.llvm.org/D46488 llvm-svn: 331591