[llvm] [AMDGPU] Loads to LDS should not increase `lgkmcnt` (PR #179305)

[Jay Foad via llvm-commits]

jayfoad wrote:

> Can you rephrase the title? They certainly do for DS loads to LDS. This is a more niche case

Technically DS loads would be loads _from_ LDS. I'm not sure what to call these. "Load to LDS" is OK but a bit subtle. "LDS DMA load" terminology is [no longer used in the hardware docs](https://github.com/llvm/llvm-project/pull/138802#discussion_r2077128825). "Load direct-to-LDS" is likely to be confused with the GFX11 `LDS_DIRECT_LOAD` instruction.

https://github.com/llvm/llvm-project/pull/179305