AMDGPU/GlobalISel: Support llvm.trap and llvm.debugtrap intrinsics

Summary: Lower trap and debugtrap intrinsics to AMDGPU machine instruction(s).

Reviewers: arsenm, nhaehnle, kerbowa, cdevadas, t-tye, kzhuravl

Reviewed By: arsenm

Subscribers: kzhuravl, jvesely, wdng, yaxunl, rovka, dstuttard, tpr, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74688