[PBQP] Add support for graph-level metadata to the PBQP graph. This will be used
in the future to attach useful information about the PBQP graph (e.g. the
associated MachineFunction, pointers to regalloc passes) to the graph itself,
making that information accessible to the solver. This should also allow the
PBQPBuilder interface to be simplified.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218848 91177308-0d34-0410-b5e6-96231b3b80d8
[PBQP] Update doxygen comment style to match the rest of the file. NFC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218849 91177308-0d34-0410-b5e6-96231b3b80d8