[llvm] [AMDGPU] Introduce "amdgpu-sw-lower-lds" pass to lower LDS accesses to use device global memory. (PR #87265)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --version 4
+; RUN: opt < %s -passes=amdgpu-sw-lower-lds -S -mtriple=amdgcn-- | FileCheck %s
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arsenm wrote:

Should specifically use amdhsa triples for these tests 

https://github.com/llvm/llvm-project/pull/87265