Duncan P. N. Exon Smith 887179f82e IR: Expose ModuleSlotTracker in Value::print()
Allow callers of `Value::print()` and `Metadata::print()` to pass in a
`ModuleSlotTracker`.  This allows them to pay only once for calculating
module-level slots (such as Metadata).

This is related to PR23865, where there was a huge cost for
`MachineFunction::print()`.  Although I don't have a *particular* user
in mind for this new code, I have hit big slowdowns before when running
`opt -debug`, and I think this will be useful.  Going forward, if
someone hits a big slowdown with `print()` statements, they can create a
`ModuleSlotTracker` and send it through.  Similarly, adding support to
`Value::dump()` and `Metadata::dump()` should be trivial.

I added unit tests to be sure the `print()` functions actually behave
the same way with and without the slot tracker.

llvm-svn: 240867
2015-06-27 00:38:26 +00:00
..
2015-06-25 10:47:08 +00:00
2015-06-17 03:13:26 +00:00
2015-05-01 20:51:49 +00:00
2015-06-19 01:53:21 +00:00