Justin Bogner 20dd36a48a MIR: Allow parsing of empty machine functions
If you run llc -stop-after=codegenprepare and feed the resulting MIR
to llc -start-after=codegenprepare, you'll have an empty machine
function since we haven't run any isel yet. Of course, this only works
if the MIRParser believes you that this is okay.

This is essentially a revert of r241862 with a fix for the problem it
was papering over.

llvm-svn: 299975
2017-04-11 19:32:41 +00:00
..