[X86] Fix Stale SDNode use in X86ISelDAGtoDAG

Summary: Fixes pr32329.

Reviewers: spatel, craig.topper

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31286

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298633 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed