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9a61a42713
Expose enough of the IR-level `SlotTracker` so that `MachineFunction::print()` can use a single one for printing `BasicBlock`s. Next step would be to lift this through a few more APIs so that we can make other print methods faster. Fixes PR23865, changing the runtime of `llc -print-machineinstrs` from many minutes (killed after 3 minutes, but it wasn't very close) to 13 seconds for a 502185 line dump. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240842 91177308-0d34-0410-b5e6-96231b3b80d8
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