AMDGPU/GlobalISel: Add support for G_INTTOPTR

Summary: This is a no-op.

Reviewers: arsenm

Reviewed By: arsenm

Subscribers: kzhuravl, jvesely, wdng, nhaehnle, yaxunl, rovka, kristof.beyls, dstuttard, tpr, t-tye, llvm-commits

Differential Revision: https://reviews.llvm.org/D52916

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343839 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed