Dereference the node iterator when dumping the PBQP graph structure in DOT
format.

Thanks to Arnaud A. de Grandmaison for the patch!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195316 91177308-0d34-0410-b5e6-96231b3b80d8
Teach ISel not to optimize 'optnone' functions.

Based on work by Andrea Di Biagio.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195317 91177308-0d34-0410-b5e6-96231b3b80d8