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Summary: This change prevents the lldb-vscode test harness from hanging up waiting for new messages when the lldb-vscode subprocess crashes. Now, when an EOF from the subprocess pipe is detected we enqueue a `None` packet in the received packets list. Then, during the message processing loop, we can use this `None` packet to tell apart the case where lldb-vscode has terminated unexpectedly from the normal situation where no pending messages means blocking and waiting for more data. I believe this should be enough to fix the issues with these tests hanging on multiple platforms. Once this lands, I'll prepare and test a separate change removing the @skipIfLinux annotations. Reviewers: clayborg, zturner Subscribers: lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D59849 llvm-svn: 357426