Duncan P. N. Exon Smith 3269215401 CodeGen: Use a single SlotTracker in MachineFunction::print() ...

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.

llvm-svn: 240842

2015-06-26 22:04:20 +00:00

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