[DAG] Prevent NodeId pruning of TokenFactors in Instruction Selection.

Summary:
Instruction Selection preserves relative orders of all nodes save
TokenFactors which we treat specially. As a result Node Ids for
TokenFactors may violate the topological ordering and should not be
considered as valid pruning candidates in predecessor search.

Fixes PR35316.

Reviewers: RKSimon, hfinkel

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D42701

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323880 91177308-0d34-0410-b5e6-96231b3b80d8