[AMDGPU] Keep consistent check of legal addressing mode.

Summary:
- Add test cases for GFX10, which has narrower offset range compared to
  GFX9.

Reviewers: rampitec, arsenm

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70473