[llvm] [AMDGPU][SDAG] Add missing cases for SI_INDIRECT_SRC/DST (PR #170323)

[Juan Manuel Martinez Caamaño via llvm-commits]

jmmartinez wrote:

I've updated the PR and added tests for vector sizes 3, 5, 6 and 7.

https://github.com/llvm/llvm-project/pull/170323