[DA][TTI][AMDGPU] Add option to select GPUDA with TTI

Summary: Enable the new diveregence analysis by default for AMDGPU.

Reviewers: rampitec, nhaehnle, arsenm

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D73049