Cherry-pick https://github.com/swiftlang/llvm-project/pull/9164 to next #9190
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When clang caching and MCCAS are enabled, on a cache miss, the object file is not written to in MachOCASWriter, instead the replay code is rerun and the object file is serialized and written out. However, in swift, the replay code isn't run on a cache miss at all, and it expects the object writer to write to the object file. This patch makes it so that on a cache miss, the MachOCASWriter always writes to the raw_ostream buffer for the object file and doesn't serialize the object file in the replay code. (cherry picked from commit ce65bfa)
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@swift-ci please test llvm |
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When clang caching and MCCAS are enabled, on a cache miss, the object file is not written to in MachOCASWriter, instead the replay code is rerun and the object file is serialized and written out. However, in swift, the replay code isn't run on a cache miss at all, and it expects the object writer to write to the object file.
This patch makes it so that on a cache miss, the MachOCASWriter always writes to the raw_ostream buffer for the object file and doesn't serialize the object file in the replay code.
(cherry picked from commit ce65bfa)