[ORC] Add WaitingOnGraph record / replay facilities. (#185275) WaitingOnGraph is critical to the performance of LLVM's JIT (see e.g. https://github.com/llvm/llvm-project/issues/179611), and these facilities will make it easier to capture and investigate test cases, and build a performance regression suite. WaitingOnGraph::OpRecorder provides an interface for classes that want to capture the essential WaitingOnGraph operations: simplify-and-emit, and fail. WaitingOnGraph::simplify and WaitingOnGraph::fail now take an optional OpRecorder pointer. WaitingOnGraphOpStreamRecorder (WaitingOnGraphOpReplay.h) is an OpRecorder implementation that serializes operations to a line-oriented text format on a raw_ostream. WaitingOnGraphOpReplay provides types and utilities for iterating over and replaying recorded operations. readWaitingOnGraphOpsFromBuffer returns an iterator range over the ops in a serialized buffer. The new ExecutionSession::setWaitingOnGraphOpRecorder method can be used to install a recorder to capture ops from OL_notifyEmitted and IL_failSymbols. The llvm-jitlink tool gains two new options: - -waiting-on-graph-capture <filename> records all WaitingOnGraph operations during a regular llvm-jitlink invocation. - -waiting-on-graph-replay <filename> replays the operations from a capture file. In this mode other arguments are ignored.
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