Add a print method to MachineFunctionProperties for better error messages

This makes check failures much easier to understand.
Make it empty (but leave it in the class) for NDEBUG builds.

Differential Revision: http://reviews.llvm.org/D18529

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264780 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed